# 3.30 Assign the position of the element having outer electronic configuration (ii)   $( n-1) d^ 2 ns^2$ for n=4.

$( n-1) d^ 2 ns^2\ for\ n=4$.
Since the valence shell contains (2+2) electrons and Group number = 4 configuration $= 1s^22s^22p^63s^23p^63d^24s^2$ element name is Titanium (Ti).