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)

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