If the electronic configuration of an element is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^2 4s^2, the four electrons involved in chemical
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
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