why is the electronic configuration of iron-1s2 2s2 2p6 3s2 3p6 3d6 4s2 and not 1s2 2s2 2p6 3s2 3p6 3d8 ?
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because 4s orbital is at an lower energy level than 3d hence 4s is filled first
the S is the least energy orbital
the S is the least energy orbital
aalex:
but then also why not 3d8??
ok thanks
got it
Because we know from experiement that 4s electron is lost first during the ionisation of the metal as the law less energy less ionisation entalpy and hence first fill
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