Q. $Be^{2+}$ is isoelectronic with which of the following ions?
A) $H^+$
B) $Li^+$
C) $Na^+$
D) $Mg^{2+}$
Explanation
[Solution] $Be^{2+}$ and $Li^+$ both have 2 electrons. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.