The number of valence electrons in a sulphide ion, S^2–, is :(a) 16 (b) 10 (c) 9 (d) 8

Correct Answer: (d) 8

Explanation: Atomic number of a sulphur atom S is 16. It has 6 electrons in its outermost orbit. After gaining 2 electrons it becomes S^2−. Hence, the outermost orbit will have 8 electrons.