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How can f d s come after each other in f-block elements

How can f d s come after each other in f-block elements

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1 Answers

Naveen Kumar
askIITians Faculty 60 Points
9 years ago
For a given shell, the energy are determined by (n+l) rule
where n=principle quantum number
and, l=azimuthal quantum number
lower the value of (n+l), lower is the energy of that orbital and hence electron should be first occupied by these lower energy orbitals.
For same number of n+l value, it is assumed that lower n value i orbital should be occupied first.
so for a given shell, the order is s<p<d<f

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