Which of the following electronic configurations is not possible … - Vidyadip

MCQ

Which of the following electronic configurations is not possible according to Hund's rule

A
$1s^2 \,2s^2$
B
$1s^2 \, 2s^1$
C
$1s^2\, 2s^2\, 2p_x^1\, 2p_y^1\, 2p_z^1$
✓
$1s^2\, 2s^2 \,2p_x^2$

✓

Answer

Correct option: D.

$1s^2\, 2s^2 \,2p_x^2$

d
configuration, $1 s^2\, 2 s^2 \,2 P_x^2$ is not possible according to Hund's rule because the pairing of electrons in the orbitals belonging to the same subshell $(p, d, f)$ does not take place unital each orbital belonging to that subshell has got one election each.

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