A Conversation for Electron Shells and Orbitals

electronic configuration

Post 1


Some scienticts say that electrons can fill the orbitalas in the following order:1s2,2s2,2p6,3s2,3p6,now 4s2 and again 3d10,4p6...Others say 1s2,2s2,2p6,3s2,3p6,3d10(instead of 4s2 as it is upper) 4s2,4p6,4d10,4f14...Iron has 26 electrons so its electronic configuration would be:1s2,2s2,2p6,3s2,3p6,4s2,3d6 according to the first example or 1s2,2s2,2p6,3s2,3p6,3d8 according to the second example.

electronic configuration

Post 2


The 1st example is correct the 4s orbital is filled before the 3d can be explained simpily as the 4s state having a lower energy than the 3d but is due to the solutions to the shrodinger equation and pertubations due to potential in an electric field

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