compounds. Thus, it is important to know which atoms carry unshared pairs. Use the structural formulas below to determine the number of unshared pairs at each designated atom. (Be sure your answers are consistent with the formal charges on the formulas.) The number of unshared pairs at atom a is HC The number of unshared pairs at atom bis b HEC H The number of unshared pairs at atom cis The number of unshared pairs at atom a is CO The number of unshared pairs at atom bis b HC OCH The number of unshared pairs at atom c is