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How would you justify the presence of 18...

How would you justify the presence of 18 elements in the `5^("th")` period of the Periodic Table?

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