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Introduction to CFT

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Question

Why the presence of 3d orbital in potassium increases its volume

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Solution

Please note that there is an error in your question. It is the absence of 3d orbital in potassium that increases its size.
Here, 4s is filled instead of 3d. 4s is farther away from nucleus than 3d, so the volume is increased.

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Reason:

(n + l)

rule is followed for determining the orbitals of the lowest energy state.

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