Question

What is isoelectronic series? Name a series that will be isoelectronic with each of the following atoms or ions.
a. F⁻
b. Ar
c. He
d. Rb⁺

Answer 1

isoelectronic species are species which have the same number of electrons in them
F-=Na+
Ar=Ca2+
He=H-
Rb+=Kr