Which of the following sets can be called isoelectronic species ?

Options

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

Answer

B

Explanation

Na : `1s^(2)2s^(2)2p^(6)3s^(1)`
`Mg^(+) : 1s^(2)2s^(2)2p^(6)3s^(1)`
are isoelectronic species.