Draw the Lewis structures for each of the following ions or molecules. Identify those in which the octet rule is not obeyed; state which atom in each compound does not follow the octet rule; and state, for those atoms, how many electrons surround these atoms: 

(a) PH_3, 

(b) AlH₃, 

(c) N3 ^-, 

(d) CH₂Cl₂, 

(e) SnF₆^2-.