Q. Which one of the following sets of ions represents a collection of isoelectronic species?
A) $K^{+},Cl^{-},Ca^{2 +},Sc^{3 +}$
B) $Ba^{2 +},Sr^{2 +},K^{+},S^{2 -}$
C) $N^{3 -},O^{2 -},F^{-},S^{2 -}$
D) $Li^{+},Na^{+},Mg^{2 +},Ca^{2 +}$
Explanation
(a)
Isoeletronic means having same number of electrons. $K^{+},Cl^{-},Ca^{2 +},Sc^{3 +}$ (all are having 18 electrons).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.