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
(a) 3p6 (b) 3p6, 4s2
(c) 3p6, 3d2 (d) 3d2, 4s2

Answer 1

The four electrons involved in chemical bond formation will be 3d²4s²

• The electronic configuration of an element 1s²2s²2p⁶3s² 3p⁶3d²4s²

• According to the given electronic configuration we can say that the element is transition metal

• For transition elements electrons of ns and (n-1)d subshell takes place in chemical bond formation

• In the above electronic configuration the outermost subshells are 3d and 4s

• They have 2 electrons each in their subshell which will contribute to bond formation