Q. $Ca^{2}$ is isoelectronic with
A) Na
B) Ar
C) $Mg^{2}$
D) Kr
Explanation
(b)
$Ca^{2 +}(2,\ 8,\ 8)$ and Ar (2, 8, 8) contains equal number (18) of electrons, hence they are isoelectronic.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.