Answer
Please see the work below.
Work Step by Step
The atomic number of Argon is 18 and it’s confiruration is $1s^{2}
2s^{2}2p^{6} 3s^{2}3p^{6}$.
Titanium, Ti – atomic number – 22.
Electronic configuration - $1s^{2} 2s^{2}2p^{6} 3s^{2}3p^{6}3d^{2}4s^{2}$.
Then using Argon core we can represent it as $[Ar] 3d^{2}4s^{2}$.
Vanadium, V – atomic number – 23.
Electronic configuration - $1s^{2} 2s^{2}2p^{6} 3s^{2}3p^{6}3d^{3}4s^{2}$.
It can be represented as $[Ar] 3d^{3}4s^{2}$.
Chromium, Cr – atomic number – 24.
Electronic configuration - $1s^{2} 2s^{2}2p^{6} 3s^{2}3p^{6}3d^{5}4s^{1}$.
It can be represented as $[Ar] 3d^{5}4s^{1}$.
