" The element with "ns^(2)np^(4)" as outer electron configuration is a "

Assing the position of the elements with outer electronic configuration ns^2np_4 (n = 3)

In the long form of periodic table, element with outer electronic configuration ns^2 , np^3 are placed in the column.

Assing the position of the elements with outer electronic configuration (n-1) d^2 ns^2(n = 4)

Elements with outer electron configuration ns2 np6 are:

Elements with outer electron configuration ns2 np6 are: