Chapter 13

First you need to find the number of valence electrons in \(\mathrm{CH}_{3} \mathrm{Cl}\). The number of valence electrons in an atom of an element is equal to the last digit in the group number of that element in the Periodic Table. \(\mathrm{C}\) is in Group ____________ \(\mathrm{H}\) is in Group _____________ In \(\mathrm{CH}_{3} \mathrm{Cl}\) there is a total of ______________ valence electrons.

How many sticks did you need to make the skeleton structure? ____________ How many sticks are left over? ____________ If your model is to obey the octet rule each ball must have four sticks in it (except for hydrogen atom balls, which need only one). (Each atom in an octet rule species is surrounded by four pairs of electrons.) How many holes remain to be filled? ____________ Fill them with the remaining sticks, which represent nonbonding electron pairs. Draw the complete Lewis structure for CH3Cl using lines for bonds and pairs of dots for nonbonding electrons.

Describe the geometry of the model, which is that of \(\mathrm{CH}_{3} \mathrm{Cl}\). _____________ Is the \(\mathrm{CH}_{3} \mathrm{Cl}\) molecule polar? ___________ Why? Would you expect \(\mathrm{CH}_{3} \mathrm{Cl}\) to have any isomeric forms? ____________ Explain your reasoning.

Would \(\mathrm{CH}_{3} \mathrm{Cl}\) have any resonance structures? ____________ If so, draw them below.