`Be^(2+)` is isoelectronic with which of the following ions ?

Options

A. `H^(+)`
B. `Li^(+)`
C. `Na^(+)`
D. `Mg^(2+)`

Answer

B

Explanation

Both `Be^(2+)` and `Li^(+)` have two electrons `(1 s^(2))` and hence are isoelectronic .