$O^{2-}$ is isoelectronic with

Find the correct set with isoelectronic species.

The atomic weight of an element is $39$. The number of neutrons in its nucleus is one more than the number of protons. The number of protons,neutrons,and electrons respectively in its atom would be

Fluoride ion $(F^-)$ is isoelectronic with:

Which of the following is not true in Rutherford’s nuclear model of atom?

What do you understand by isoelectronic species? Name a species that will be isoelectronic with each of the following atoms or ions.
$(i)$ $F^{-}$
$(ii)$ $Ar$
$(iii)$ $Mg^{2+}$
$(iv)$ $Rb^{+}$