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Why Their Is Exceptional Case of Chromimum and Copper in Periodic Table As electronic configuration??????

Why Their Is Exceptional Case of Chromimum and Copper in Periodic Table As electronic configuration??????
 

Grade:11

1 Answers

Chemistry Expert - askIITians
askIITians Faculty 36 Points
6 years ago
According to Aufbau Principle we fill the lowest energy orbital first then filling of higher ones is done, But in some scenarios this principle is not followed like in the cases of Chromium and Copper:

According to Aufbau Principle filling should be:
Cr: [Ar] 4s2 3d4
Cu: [Ar] 4s2 3d9

But it was found to be:
Cr: [Ar] 4s1 3d5
Cu: [Ar] 4s1 3d10

This occurs to attain the greater stability as half filled orbital are more stable as compared to incomplete or partially filled. Hence to attain the stability Aufbau principle is neglected sometimes.

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