Q. Isoelectronic pair among the following is
A) Ca and K
B) Ar and $Ca^{2 +}$
C) K and $Ca^{2 +}$
D) Ar and K
Explanation
(b)
$Ar\ and\ Ca^{2 +}$ are isoelectronic species as they have same number of electrons, $i.e$., 18.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.