Why is the arrangement of electrons in energy levels levels for the ground state configuration of potassium 2,8,8,1 not 2,8,9
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Expert's answer
2020-05-20T13:44:48-0400
since in this case 4s is filled first, and not 3d orbital. The sum of quantum numbers is less for 4s than for 3d => it is the 4s sublevel that will be filled first with electrons, although it is formally located farther from the core than 3d.
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