Question

Which of the following configurations does not follow Hund’s rule of maximum multiplicity?

• A. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{2}$
• B. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}$
• C. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{5}$
• D. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}4s^{2}$

Answer 1

Answer: (D)

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}4s^{2}$

Answer 2

: The configuration does not follow Hund’s rule of maximum multiplicity because 3p will be be fully filled before the electrons go to 4s.