Question: If the electronic configuration of an element is 1s2 2s2 2p6 3s2 3p6 3d2 4s2, the
four electrons involved in chemical bond formation will be_____.
(i) 3p6
(ii) 3p6, 4s2
(iii) 3p6, 3d2
(iv) 3d2, 4s2
Solution:
Option (iv) 3d2, 4s2 is the answer.
