Question

which of the following ions came from an atom that gained 2 electrons?
A. 0^2-
B. Li+
C. Mg^3+
D. N^3-

Answer 1

Group 6 elements like Oxygen like to take on the extra two electrons to become a 2- anion and take on the noble gas configuration. so the O^2-, which looks like O=O, will have two oxygens sharing two electrons.... answer is O^2-