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d orbital vs s orbital... a small chemistry question


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For the transition metal element Cr


why are there 5 electrons filling the 3d orbital and only 1 electron filling the 4s orbital?


I initially think that there should be 4e in 3d and 2e in 4s


Why is my way of electron configuration less stable than the one in the question?



please help



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half filled orbitals are more stable than 4s2 and 3d4


a half filled orbital is still reactive unlike a fully filled orbital but it is preferrable over the other options available.


to have 2 electrons in the 4s2 but only 4 in the 3d orbital is at a higher energy, things like low energies.

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