Your task is to construct a 3-dimensional model of the CH 3 Cl molecule. 1.First

Question

Your task is to construct a 3-dimensional model of the CH3Cl molecule.

1.First you need to find the number of valence electrons in CH3Cl.

C is in Group ______ and has ______ valence electrons

           H is in Group ______ and has ______ valence electrons

           Cl is in Group ______ and has ______ valence electrons

           In CH3Cl there is a total of ______ valence electrons.

2.The model consists of balls and pegs. What kind of ball should you select for the:

C atom should have ______ holes in the ball

           H atom should have ______ holes in the ball

           Cl atom should have ______ holes in the ball

           The electrons in the molecule are paired and each peg represents an electron pair.

           How many pegs do you need? ______

3.Assemble the molecule connecting the balls with pegs into one unit. Use the rule that C atoms form four bonds, whereas H and Cl atoms usually form one bond. Draw a sketch of the structure below.

4.How many pegs do you need to make the structure? ______

           How many pegs are left over? ______

     If your model is to obey the octet rule each ball must have four pegs in it (except for hydrogen atom balls which need only one).

           How many holes remain to be filled? ______

     Fill them with the remaining pegs which represent nonbonding electron pairs. Draw the complete Lewis structure for CH3Cl using lines for bonds and pairs of dots for nonbonding electrons.

5.Describe the geometry of the CH3Cl 3-dimensional model.

           Is the CH3Cl molecule polar? Why?

          Would you expect CH3Cl to have any isomeric forms?       Explain your reasoning.

6.Would CH3Cl have any resonance structures? If so, draw them below.

Explanation / Answer

Ans 1 :
The number of valence electrons in an element can be identified by its position in the modern periodic table. The valence electrons of all the atoms constituting in the molecule makes the total valence electrons of the molecule.

C is in group 14 , and has 4 valence electrons.

H is in group 1 , and has 1 valence electron.

Cl is in group 17 , and has 7 valence electrons.

In CH3Cl there is a total of 14 valence electrons.

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