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Pauli's Exclusion Principle

Aufbau princi...

Question

Aufbau principle fails to explain the configuration of element with atomic number:

A

18

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B

21

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C

24

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D

27

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Solution

The correct option is B 24
Chromium has atomic number 24.
Actual electronic configuration: $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{5} 4 s^{1}$ .
According to Aufbau: $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{4} 4 s^{2}$ .
Discripency is because of extra stability of half filled $(d^{5})$ orbitals.

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