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Draw the Lewis structures for each of the following molecules
or ions. Identify instances where the octet rule is not
obeyed; state which atom in each compound does not follow
the octet rule; and state how many electrons surround these
atoms: (a) PF6-, (b) BeCl2, (c) NH3, (d) XeF2O (the Xe is the
central atom), (e) SO42 - .