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How would you justify the presence of 18...

How would you justify the presence of 18 elements in the 5th period of the Periodic Table?

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When n=5, l=0,1,2,3. The order of the increasing energy orbitals are `5s lt 4d lt 5p`. The total number of orbitals available is nine. The maximum number of electrons that can accommodate is 18 and therefore 18 elements are there in the `5^(th)` period.
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