Identify all nonbonding lone pairs of electrons in the following molecules, and tell what geometry you expect for each of the indicated atoms. (a) The oxygen atom in dimethyl ether, CH3OOOCH3 (b) The nitrogen atom in trimethylamine, H3C N CH3 CH3 (c) ,PH3 (d) The sulfur atom in the amino acid methionine, CH3 S CH2CH2CHCOH NH2