Write Lewis structures that obey the octet rule for each of the following molecules and ions. (In each case the first atom listed is the central atom.) (Do this on paper. Your instructor may ask you to turn in this work.) (a) POCl3, SO42-, XeO4, PO43-, ClO4- (b) NF3, SO32-, PO33-, ClO3- (c) ClO2-, SCl2, PCl2- (d) Considering your answers to parts a, b, and c, what conclusions can you draw concerning the structures of species containing the same number of atoms and the same number of valence electrons