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  • 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 bond formation will be_____. (i) 3p^{6} (ii) 3p^{6},4s^{2} (iii) 3p^{6},3d^{2} (iv) 3d^{2},4s^{2}

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 bond formation will be_____.

(i) 3p^{6}
(ii) 3p^{6},4s^{2}
(iii) 3p^{6},3d^{2}
(iv) 3d^{2},4s^{2}

Answers (1)

The answer is the option (iv) 3d^{2},4s^{2}

Explanation: In transition elements ns electrons and (n-1)d electrons participate, while in bonding, electrons and valence electrons from penultimate shell participate. Therefore, the bond formation will be 3d^{2},4s^{2}

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