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i did not understood the eletronic configuration of chromium???

i did not understood the eletronic configuration of chromium???

Grade:11

1 Answers

Aarti Gupta
askIITians Faculty 300 Points
9 years ago
Chromium having atomic no.24 have expected configuration-
1s2,2s2,2p6,3s2,3p6,3d4,4s2
but the actual configuration is
1s2,2s2,2p6,3s2,3p6,3d5,4s1
This actual configuration is due to the fact that half-filled electronic configuration have extra-stability,because of symmetrical distribution of electrons and such symmetry leads to extra stability.So one of the e- from 4s orbital gets promoted to 3d orbital.Chromium is one of the element having exceptional configuration.

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