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

`""_(11)Na=1s^(2) 2s^(2) 2p^(6) 3s^(1),""_(12)Mg^(+)=1s^(2) 2s^(2) 3p^(6) 3s^(1)`