Dichloromethane (CH2Cl2) contains one carbon atom, two hydrogen atoms and two chlorine atoms. In this post, we discussed the method to construct the CH2Cl2 Lewis structure. These valence electrons are the ones that participate in the bond formation. Valence shell electron pair repulsion (VSEPR) theory helps to determine the geometry of a molecule on the basis of stoichiometry, the number of bond pairs, and the number of lone pairs on the central atom. According to the VSEPR theory, for a regular tetrahedral structure, the bonded atoms around the central atom will spread at an angle of approx 109.5 to minimize the repulsion and attains stability. Examples: CH 4, NH 3, I 2. In general you want: Why are there different ways for the "same" Lewis structure? The compound is also used in the production of aerosol formulations. A passion for sharing knowledge and a love for chemistry and science drives the team behind the website. An electron in an atoms outermost shell is known as a valence electron. The total lone pair present in the H2O2 lewis dot structure is 4. There are twenty valence electrons in the compound, and four bonds are formed. Remember that, there are total of ten electron pairs. Having an MSc degree helps me explain these concepts better. The molecular geometry or shape of CH2Cl2 is Tetrahedral, since, there are 4 regions of electron density around the central atom, and all the regions are bonding regions. Now we will find the least electronegative atom in the CH2Cl2 compound, after that, we will place it at the center of the lewis diagram and the rest atoms will be spread around it. Cl: Carbon, Hydrogen, and Chlorine. The compound is naturally derived from the volcanoes, wetlands and other oceanic sources. To calculate the formal charge on the central carbon atom of the CH2Cl2 molecule by using the following formula: The formal charge on the carbon atomof CH2Cl2 molecule= (V. E(C) L.E(C) 1/2(B.E)), V.E (C) = Valence electron in a carbon atom of CH2Cl2molecule. and more. As we have already place carbon and Hydrogen atoms, we just have to place a Chlorine atom in this structure. Each electron pair (:) in the lewis dot structure of CH2Cl2 represents the single bond ( | ). So let us have a look at the total number of valence electrons for CH3Cl. This will be the sum of the group number a of all atoms plus the charge. Learnool.com was founded by Deep Rana, who is a Mechanical Engineer by profession and a blogger by passion. So, now only six electron pairs are remaining to mark as lone pairs. is polarity in the compound. All rights Reserved, Follow some steps for drawing the Lewis dot structure for CH2Cl2. Thus four valence electrons of Carbon, two electrons of Hydrogen and Chlorine each participate in the bond formation. eg=linear, mg=linear. Here in the CH2Cl2 molecule, if we compare the carbon atom (C) and chlorine atom (Cl), then the carbon is less electronegative than chlorine. The formula for the formal charge is as follows. } 5. CH2Cl2 is a moderately polar molecule. Required fields are marked *. Put our Hydrogens here, and then our Chlorines. These pairs of electrons present between the Carbon & Chlorine atoms as well as between the Carbon & Hydrogen atoms form a chemical bond, which bonds these atoms with each other in a CH2Cl2 molecule. 2. ) iii. Place C in the center and attach 2 Cl atoms to it, and attach 2 After determining the center atom and skeletal of CH2Cl2 molecule, we can start to mark lone pairs on atoms. Here, the given molecule is CH2Cl2. - Science Education and Tutorials, NH3 Molecular Geometry - Science Education and Tutorials. In the lewis structure of CH2Cl2, there are four single bonds around the carbon atom, with two hydrogen atoms and two chlorine atoms attached to it, and on each chlorine atom, there are three lone pairs. Well choose the least electronegative value atom in the CH2Cl2 molecule to place in the center of the CH2Cl2 Lewis structure diagram in this phase. Lets count the formal charge on the chlorine atom first(4th step structure). More Online Free Calculator. For this compound, there is one molecule of Carbon, two molecules of Hydrogen and two molecules of Chlorine.
It is a colorless and volatile liquid with a sweet smell. Start typing to see posts you are looking for. polarised toward the more electronegative chlorine, The CH2Cl2 molecule is classified as a polar molecule, chlorine octet rule, please see in our previous post, The polarity of CH2Cl2 is discussed in our previous post, How to draw BeCl2 Lewis Structure? Totally, 12 valence electrons placed on the two chlorine atoms of the CH2Cl2 molecule. Chlorine is the most electronegative atom. In order to draw the lewis structure of CH2Cl2, first of all you have to find the total number of valence electrons present in the CH2Cl2 molecule. Now, we know how many electrons are there in 1 Answer. atom. June 23, 2022. The lewis structure of CH2Cl2 contains 4 single bonds in the form of two C-H bonds and two C-Cl bonds. Wiki User. Two hydrogen and two chlorine atoms share those 4 electrons with carbon to achieve the octet. It should be noted that the electron geometry of CH2Cl2 is also Tetrahedral, since, no lone pair is present on the central atom, hence, only bonding pairs are counted while evaluating the geometry of CH2Cl2. In the following computation, the formal charge will be calculated on the central carbon atom of the CH2Cl2 Lewis dot structure. The central atom is the one that has the highest bonding capacity; it is the atom that is the shortest of the octet. The main idea is that in order to form a bond, each atom has to donate an elec. i. The central carbon atom undergoes octet stability. Lewis Structure. It is also metabolized in the body to form carbon monoxide and can cause poisoning. Total number of valence electrons available for the CH2Cl2 Lewis structure = 4 + 1(2) + 7(2) = 20 valence electrons" Notify me of follow-up comments by email. But no need to mark on hydrogen, because each hydrogen has already two electrons. All the four electrons are arranged in these hybridized orbitals, making the hybridization of this molecule sp3. Formal charge on carbon atomof CH2Cl2 molecule = (4- 0-(8/2)) =0. It is the simplest and most limited theory on electronic structure. Answers is the place to go to get the answers you need and to ask the questions you want These overlapped orbitals are called hybrid orbitals. In a CH2Cl2 molecule, the outer atom is hydrogen and chlorine. In this article, we will know the structure, In Lewis structure the lines represent the bonds and dots represent the valence electrons. "@context": "https://schema.org", In the very first step, we will count the total valence electron in the CH2Cl2 molecule. the fewest number of formal charges possible, i.e. Hence, carbon has four valence electrons, hydrogen has one valence electron, and chlorine has seven valence electrons. due to carbon is more electropositive than chlorine and considering stability of molecule, carbon is the center atom. Chloromethane ( CH3Cl) has 14 valence electrons. By looking at the CH2Cl2 lewis structure, we see there are 4 single bonds means 4 bonding pairs, and there are 12 dots electrons around two chlorine atoms means 6 lone pairs. Save my name, email, and website in this browser for the next time I comment. By looking at the CH2Cl2 lewis structure, we see there are 4 single bonds means 4 bonding pairs, and there are 12 dots electrons around two chlorine atoms means 6 lone pairs. The Lewis electron structure for the NH 4+ ion is as follows: The nitrogen atom shares four bonding pairs of electrons, and a neutral nitrogen atom has five valence electrons. Hence, Chloromethane has a tetrahedral molecular geometry to avoid the repulsive forces and separating the bonded electrons. First week only $4.99! Since carbon is less electronegative than chlorine, assume that the central atom is carbon. Hydrogen peroxide is polar in nature and has a non-planar structure. In simple words, we have to check whether the central Carbon (C) atom is having 8 electrons or not. Furthermore, carbon has a four electrons limit since chlorine is the most electronegative element in the CH2Cl2 molecule. Lone pairs are those represented as dots in the lewis diagram that do not take part in the formation of bonds and are also called nonbonding electrons. Explore molecule shapes by building molecules in 3D! The carbon atom has an electronegativity of 2.55, while chlorine has an electronegativity of 3.16 in the CH2Cl2 molecule. Also, it has bond angles of 109.5, which corresponds to its molecular geometry. Published By Vishal Goyal | Last updated: December 29, 2022, Home > Chemistry > CH2Cl2lewis structure and its molecular geometry. Jay is an educator and has helped more than 100,000 students in their studies by providing simple and easy explanations on different science-related topics. Therefore, place carbon in the center and hydrogen and chlorine on either side. Valence electron in chlorine atom = 7 Transcript: This is the Lewis structure for CH2Cl2. It has many uses, but majorly it is used in the food industry. Place remaining electrons on outer atoms and complete their octet. As the shape of the molecule is tetrahedral and Carbon and Chlorine have a difference in their electronegativity. A single bond means two electrons, in the above structure, four single bonds are used for connecting the two chlorine and two hydrogens atoms to the carbon central atom. To understand its chemical properties and physical properties, one needs first to know the Lewis structure and molecular geometry of CH. Connect outer atoms to the central atom with a single bond. And if not writing you will find me reading a book in some cosy cafe! Then place the valence electron in the chlorine atom, it placed around seven electrons(step-2). Im a mother of two crazy kids and a science lover with a passion for sharing the wonders of our universe. The carbon core atom (four single bonds connected to two chlorine and two hydrogen atoms ) of the CH2Cl2 molecule has four valence electrons, no lone pair of electrons, and eight bonding electrons. Due to the difference in electronegativity value of greater than 0.5, the C-Cl bond of the CH2Cl2 molecule becomes polar. The central atom Carbon (C) is bonded with four atoms (two hydrogen and two chlorine atoms) and it has no lone pair which means, it is an AX4 type molecule, as per VSEPR theory, its geometry or shape is tetrahedral. - Polarity of Dichloromethane, C2H5OH Lewis structure, molecular geometry, hybridization,, CH3NH2 Lewis structure, molecular geometry, hybridization,, N3- lewis structure, molecular geometry, hybridization, bond, NO3- lewis structure, molecular geometry, bond angle,, NO2- lewis structure, molecular geometry, bond angle,, HCOOH Lewis structure, molecular geometry, hybridization,, POCl3 lewis structure, molecular geometry, hybridization,, ClF5 Lewis structure, molecular geometry, bond angle,, BrF3 Lewis structure, molecular geometry, bond angle,. See answer (1) Copy. You also have to see whether the chlorine atoms are forming an octet or not! In this step, we have to check whether the central atom (i.e carbon) has an octet or not. It also depends on the electronegativity of the molecules participating in the formation of the compound. The Lewis theory of chemical bondingalthough quite primitive and the most limited theory on electronic structuredoes help one to determine how valence electrons are arranged around the constituent atoms in a molecule. Total no of valence electrons of CH3Cl = Valence electrons of Carbon + Valence electrons of Hydrogen + Valence electrons of Chlorine, Valence electrons of Hydrogen: 1 * 3 = 3 electrons ( as there are three hydrogen atoms, we will consider valence electrons of all the Hydrogen atoms ), Valence electrons of Chlorine: 7 valence electrons, Total no of valence electrons of CH3Cl= 4 + 3 +7. In the Lewis structure of CH3Cl, Carbon is at the central position and all the other atoms around it. The chlorine atom belongs to the periodic group 7A or 17th in the periodic table, hence, the valence electron for the chlorine atom is 7. Now, we shall construct a skeleton of the molecule with carbon as the central atom. Now just check the formal charge for the above structure to know whether it is stable or not. Carbon needs 4 more electrons for its octet to be complete. Stannous chloride, SnCl 2 is a white crystalline compound with molar mass 189.6 g/mol. Chloromethane or Methyl chloride having a molecular formula of CH3Cl is an organic compound. "acceptedAnswer": { Whereas the ones that do not participate in forming any bonds are called lone pairs of electrons or non-bonding pairs of electrons. Because carbon and chlorine are members of the periodic tables carbon and halogen family groups, their valence electrons are four and seven, respectively. Both chlorine atom has three lone pairs and carbon atom does not has lone pairs. [ 2 dot electrons means one lone pair). So we have to only mark the remaining six electron pairs as lone pairs on the sketch. Is it polar or nonpolar? Lewis structure is a theory that helps in understanding the structure of a given compound, based on the octet rule. DCM has tetrahedral molecular geometry and it is trigonal pyramidal in shape. To summarize, we can say the following for a single molecule of Chloromethane. I am Savitri,a science enthusiast with a passion to answer all the questions of the universe. only has one electron in its last shell (valence shell).Carbon What is the shape of each molecule? So, out of the total of 20 valence electrons available for the CH2Cl2 Lewis structure, we used 8 for the CH2Cl2 molecules two C-Cl and C-H bonds. Count total valence electron in CH2Cl2. Weve positioned 8 electrons around the central carbon atom(step-3), which is represented by a dot, in the CH2Cl2 molecular structure above. Now, we can study, how dichloromethane's lewis structure is drawn step by step in this tutorial. Is CH2Cl2 polar or non-polar? Start your trial now! To understand the Lewis structure lets first calculate the total number of valence electrons for Dichloromethane. Here, the outside atoms are hydrogens and chlorines. For that, you need to remember the formula of formal charge; Formal charge = Valence electrons Nonbonding electrons (Bonding electrons)/2. Both the Chlorine atoms have 3 lone pairs. Therefore, there are four singe bonds around carbon atom. Using Equation 8.5.1, the formal charge on the nitrogen atom is therefore. 3. so off of the C would be your two Cls and two Hs. by converting lone pairs to bonds. The approx bond angle in CH 2 Cl 2 is based on the type of bond, Cl-C-H = 108, H-C-H = 112, Cl-C-Cl = 112.2. It is a colorless liquid and has a chloroform-like odor. Check out the MO diagram for CH2Cl2. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright 2023 Science Education and Tutorials | authored by SciEduTut. Your email address will not be published. CH2Cl2 Lewis Structure, Molecular Geometry, Hybridization, and MO Diagram. Gilbert Lewis's idea explained the covalent bond and set the foundation for valence bond theory. Total electron pairs = total valence electrons 2, So the total electron pairs = 20 2 = 10. Note: Hydrogen (H) always goes outside.3. However those all steps are mentioned and explained in detail in this tutorial for your knowledge. The CH2Cl2 molecule has a permanent dipole moment due to an unequal charge distribution of negative and positive charges. where to buy georgia bourbon snow cream; SMOJ. You should learn to recognize any of the possible Lewis structures. Thiosulfate ion contains two sulfur atoms and three oxygen atoms. ), Periodic table labeled (14 different labeled images), Periodic table with electronegativity values, Protons neutrons and electrons of all elements. pairs = bonds + bonds + lone pairs at valence shells. The C-Cl and C-H bond lengths are 176 and 107 pm(picometer) respectively. With the help of four single bonds, it already shares eight electrons. For detailed information, you must read out an article on the polarity of CH2Cl2. Total electron pairs are determined by dividing the number total valence electrons by two. The drawing process of the lewis structure of CH2Cl2 is easy and simple. The polarity of CH2Cl2 is discussed in our previous post. We shall start by calculating the number of valence electrons in each atom of CH2Cl2 in order to see how short an atom is from an octet (or duplet in the case of hydrogen). The compound is also not safe for people with heart-related issues as it can cause abnormal heart rhythms and heart attacks when inhaled for an extended period. Place the least electronegative atom at the center. Cl. Start typing to see posts you are looking for. Note that there are 8 atomic orbitals mixing to form 8 molecular orbitals. Sn is sp2 hybridized with a bond angle 950 and Sn-Cl bond length 242 pm. It is a colorless and volatile liquid with a sweet smell. The arrangement of the molecules in this compound is such that the Carbon atom is in the central atom, one Hydrogen atom is on the upper topmost position and the other one is on the left side of the central atom. Therefore,(4 single bonds 2) = 8 valence electrons are used in the above structure from the total of 20 valence electrons available for drawing the lewis structure of CH2Cl2. In order to determine the formal charges on all the atoms in C2H 3Cl, or vinyl chloride, draw its Lewis . It is non combustible and non flammable in nature. Just another site. It has 14 valence electrons, and all of them participate in forming bonds. Number of steps can be changed according the complexity of the molecule or ion. It is an odorless and transparent gas that was initially used as a refrigerant. 4)Write the Lewis structure for CH2Cl2 in the box, distributing theremaining valence electrons so that the carbon and chlorine atomsare in accordance with the octect rule and the H atoms inaccordance with the duet rule. explanation helped slightly. Here hydrogen can not be the central atom. The carbon-chlorine bonds in dichloromethane(CH2Cl2), for example, are polarised toward the more electronegative chlorine, and because both bonds have the same size and located around four terminals with two chlorine and two hydrogen atoms, their sum is non zero due to the CH2Cl2 molecules bond dipole moment and the lone pairs of electron on two chlorine atoms. Here we have three types of atoms in CH3Cl: Carbon, Hydrogen, and Chlorine. "text": " Valence electron in hydrogen atom = 1 (7 6 2/2) = 0 formal charge on chlorine atoms. Chemistry. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Welcome to Techiescientist.com. The electronegativity of an atom is the strength with which it may attract bound electron pairs to its side. The steric number of the carbon central atom in the CH 2 Cl 2 molecule is 4, thus, it forms Sp 3 hybridization. Simultaneously, both hydrogen atoms will achieve their respective duplets, and both chlorine atoms will achieve their respective octets, and thereby the situation will be a win-win for all five atoms. Let's connect through LinkedIn: https://www.linkedin.com/in/vishal-goyal-2926a122b/, Your email address will not be published. Determine the electron geometry (eg) and molecular geometry (mg) of CO2. It is represented by dots in the CH2Cl2 Lewis diagram. Copyright 2023 - topblogtenz.com. Electrons are represented as dots, and each pair of bonding electrons between two atoms is shown as a line. The atomic number of calcium is 20, and the atomic number of argon (a noble gas) is 18, so calcium is on the second column of the periodic table. Total number of Valence electrons = 4 + 2*1 + 2*7. ), Lewis Structure of ClO2- (With 6 Simple Steps to Draw! Central Carbon is hybridized as the molecule forms all the four bonds in the. Hey folks, this is me, Priyanka, writer at Geometry of Molecules where I want to make Chemistry easy to learn and quick to understand. The CH2Cl2 molecule is classified as a polar molecule. Two Chlorine and two hydrogen atoms establish covalent connections with the central carbon atom as a result, leaving the carbon atom with no lone pair. A) B) :Cl-C-Cl: 9 C) D) E) Show transcribed image text. Lewis Structures is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts. As the Carbon atom needs 4 electrons to complete its octet, all the valency is satisfied, and it now has eight electrons in its valence shell. Step 2: For output, press the "Submit or Solve" button. Dichloromethane (CH 2 Cl 2) contains one carbon atom, two hydrogen atoms and two chlorine atoms. formal charges of 0 for as many of the atoms in a structure as possible. But, How to calculate the formal charge on a carbon atom in CH2Cl2 Lewis Structure? Note: H always goes outside. In the lewis structure of CH 2 Cl 2, there are four single bonds around the carbon atom, with two hydrogen atoms and two chlorine atoms attached to it, and on each chlorine atom, there are three lone pairs. Chlorine is a group 17 element on the periodic table. Each C-Cl bond carries two electrons because each carbon atom is connected to two chlorine and two hydrogen atoms by two C-Cl and C-H bonds. While selecting the center atom, always put the least electronegative atom at the center. Hydrogen atoms only need two valence electrons to fulfill the outer shell. Mark charges on atoms if there are charges. When there is no lone pair, then, central atom with four region of electron density adopt a tetrahedral structure because repulsion is minimum in electron pairs at this position. a The standard deviation of the sample is 18.26 b The interquartile range is 18 C 25% of values in the sample are smaller than 13. d_ The largest value in the sample was 50. These four orbitals hybridize together to form four identical sp3 orbitals, all of which have the same energy. There is no lone pair on the carbon central atom that resist the bond pairs of the two C-Cl and C-H. Lewis Structures. IF3 Lewis Structure, Hybridization, Molecular Geometry, and Polarity, CO32- Lewis Structure, Molecular Geometry, Hybridization, and MO Diagram. is a group IA element in the periodic table and It should be noted that, In CH2Cl2, the carbon (C) atom has attached to four bonded atoms(2 hydrogen and 2 chlorine atoms), and it contains no lone pair which means, there are four regions of electron density around the carbon central atom. The bonds formed in Dichloromethane are covalent bonds. Answer (1 of 2): In addition to what Quora User has written, I will mention some general points about Lewis structures. So, we are left with 12 valence electrons. There is no overall charge in dichloromethane molecule. For, Cl, we can now draw a Lewis structure for the same. Heres how you can draw the CH2Cl2 lewis structure step by step. In this article, we will discuss CH2Cl2 lewis structure, molecular geometry or shape, bond angle, polar or nonpolar, its hybridization, etc. ii. Hence, the carbon atom is the least electronegative atom in the CH2Cl2 compound, therefore, we will put the carbon atom in a central position and (the chlorine and hydrogen atoms) in the surrounding position in the lewis diagram. Hence, there will not be any change in the above structure and the above lewis structure of CH2Cl2 is the final stable structure only. Step 1. In this step, we will put the remaining valence electron on the outer atom first for completing their octet. Accessibility StatementFor more information contact us atinfo@libretexts.orgor check out our status page at https://status.libretexts.org. To see. Techiescientist is a Science Blog for students, parents, and teachers. Draw the Lewis structure for CH3Cl and CO2; carbon is the central atom in both molecules. In the lewis structure of CH 2 Cl 2, carbon atom is located as the center atom and other atoms have made bonds with carbon atom. but not soluble in water. Now once again count the total valence electron in the above structure. It is also used in food technology as a solvent. Lewis structure of CH2Cl2 contains a single bond between the Carbon (C) & Hydrogen (H) atoms as well as between the Carbon (C) & Chlorine (Cl) atoms. Hydrogen is a group 1 element on the periodic table. We have a total of 20 valence electrons for CH2Cl2. It determines the number of outermost valence electrons as well as the electrons engaged in the CH2Cl2 molecules bond formation. To understand its chemical properties and physical properties, one needs first to know the Lewis structure and molecular geometry of CH3Cl. Carbon is a group 14 element on the periodic table. The shape of the compound is a trigonal pyramidal. In contrast, the Chlorine atom also completes its octet as it shares an electron with the Carbon atom. The atoms that have complete octets or rather suffice the octet rule become inert and non-reactive. (ignore the ">" without them the formatting is off because Now we need to add lone pairs of electrons. 1 triple bond and 2 single bonds. This problem has been solved! In Lewis structure, we use dots to represent electrons and lines to show bonds formed between two atoms. Hydrogen is a period 1 element, so it can not keep more than 2 electrons in its last shell. There are 2 electrons in its K shell and 4 electrons in the L shell. lewis structure. The carbon atom has an electronic configuration of 1s22s22p2 in its ground state and has when it is in an excited state; the configuration is 1s22s12p3. arrow_forward Methylene chloride, also known as Dichloromethane (DCM), is an organic chemical compound. Save my name, email, and website in this browser for the next time I comment. Home How to draw CH2Cl2 Lewis Structure? the valence electrons C has four e-, H has 1 e-x2 so 2e-, and Cl While the most complete structure is more useful for the novice chemist, the simplest is quicker to draw and still conveys the same information for the experienced chemist. This molecule has a tetrahedral shape, and the central carbon atom has sp3 hybridization. There are eight electrons being shared in the Lewis structure of CH2Cl2. So for each chlorine, there are three lone pairs, and for carbon, there is zero lone pair because all six electron pairs are over. To read, write and know something new every day is the only way I see my day! The structure of stannous chloride is angular or v-shaped with two bond pair and one lone pair. This is reflected in the slight asymmetry in the molecular shape of the latter. Carbon and Chlorine form a single bond as they share one electron to complete each others octet. The goal is to obtain the "best" electron configuration, i.e. The carbon atom completes its molecular stability in the CH2Cl2 molecule because it possesses 8 electrons in its bond pairs with two chlorine and two hydrogens in the outermost valence shell. Each of these hybrid orbitals has one electron and can accept one more. The CH2Cl2 molecules C-Cl bonds are arranged in asymmetrical order around the tetrahedral molecular geometry, giving rise to the CH2Cl2 molecular shape. Step-2: Lewis Structure of CH2Cl2 for constructing around the more electronegative atom. Also, Chlorine is a group VIIA H atoms to it. Draw the Lewis dot structure of CH2N2. The following is an example of how to draw the "best" Lewis structure for NO3- (learning by example). We aim to make complex subjects, like chemistry, approachable and enjoyable for everyone. it's dipole dipole intermolecular force. In the Lone Molecular Electron ridi Bond Pairs AX AXE AX Ch 4 The shape of molecules Soka Thus far, we have used two-dimensional Lewis structures to represent molecules. Now, if you see closely, the Carbon atom is sharing four electrons with three hydrogen atoms and a Chlorine atom. yeah im not sure how to draw it out but ill explain it, first Ask your chemistry questions and find the answers, Determine total electrons pairs existing as lone pairs and bonds. So far, weve used 20 of the CH2Cl2 Lewis structures total 20 outermost valence shell electrons. Valence electrons given by Carbon (C) atom = 4Valence electron given by each Hydrogen (H) atom = 1Valence electrons given by each Chlorine (Cl) atom = 7So, total number of Valence electrons in CH2Cl2 molecule = 4 + 1(2) + 7(2) = 20.

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