MCQ
Which of the following electronic configuration is not possible according to Hund’s rule
- A$1{s^2}2{s^2}$
- B$1{s^2}2{s^1}$
- C$1{s^2}2{s^2}2p_x^12p_y^12p_x^1$
- ✓$1{s^2}2{s^2}2p_x^2$
✓
Answer
Correct option: D.
$1{s^2}2{s^2}2p_x^2$
d
(d) According to Hund's rule electron first fill in unpaired form in vacant orbital then fill in paired form to stabilized the molecule by which $1{s^2},2{s^2},2p_x^2$ is not possible. According to Hund's rule. Because $2{p_x},{p_y},{p_z}$ have the same energy level so electron first fill in unpaired form not in paired form so it should be $1{s^2},\,2{s^2},\,2p_x^1,2p_y^1$.
(d) According to Hund's rule electron first fill in unpaired form in vacant orbital then fill in paired form to stabilized the molecule by which $1{s^2},2{s^2},2p_x^2$ is not possible. According to Hund's rule. Because $2{p_x},{p_y},{p_z}$ have the same energy level so electron first fill in unpaired form not in paired form so it should be $1{s^2},\,2{s^2},\,2p_x^1,2p_y^1$.
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