Question

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 ____.

• A. $3p^{6}$
• B. $3p^{6},4s^{2}$
• C. $3p^{6},3d^{2}$
• D. $3d^{2},4s^{2}$

Answer 1

Answer: (D)

$3d^{2},4s^{2}$

Answer 2

: Electrons from outermost shells ns and (n-1)d take part in bond formation for transition elements.