Which molecule below contains the largest number of nonbonding electrons?

Question

Quizplus · Accepted Answer

The molecule OS (oxygen monosulfide) contains the largest number of nonbonding electrons. Oxygen has 6 valence electrons and sulfur has 6 valence electrons. In the OS molecule, two electrons (one from each atom) are used to form a bond between the oxygen and sulfur, leaving 10 nonbonding electrons (5 from oxygen and 5 from sulfur) which is the highest among the given options.

Which Molecule Below Contains the Largest Number of Nonbonding Electrons