Which statement (s) are correct ?
(1) A 3s sub - shell has a maximum of 8 electrons.
(2) An element with configuration of `1s^(2) 2s^(2)3p^(6)3s^(2)` would be in the same group as beryllium.
(3) The general electronic configuration of the group containing `N_(2)` is `ns^(2) np^(2)`.
(4) A strontium atom has a filled outer shell if it loses tow electrons.

Options

A. 1,2 and 3
B. 1 and 3
C. 2 and 4
D. Only 4

Answer

C

Explanation

(1) Incorrect 3- s -sub - level can have a maximum of 2 electrons.
(2) Correct : It is the electron configuration of Mg .
(3) Incorrect : The correct valence shell configuration of this group is `ns^(2)np^(3)` .
(4) Correct : It is in second group with only two valence electrons.