3. Count the number of valence electrons and draw Lewis (Kekule) structures for the following ions. Four are cations: ammonium (NH4+); nitronium (NO2+); methylammonium (CH6N+); formamidinium ( CH2N2+) and four are anions: cyanide (CN); hydroxide (OH); azide (N3); and bicarbonate (OCO2H frequently written HCO); Cations