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 fol- low the octet rule; and state, for those atoms, how many electrons surround these atoms:

(a) ph3,

(b) alh3,

(c) n3-,

(d) ch2cl2,

(e) snf62-.