On the basis of quantum numbers justify that presence of 18 elements in the 5 period
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The total number of orbitals available are 9. The maximum number of electrons that can be accommodated is 18; and therefore 18 elements are there in the 5th period. In 5th period , 5s,5p and 4d orbital will be filled up having max. Capacity 2+6+10 =18 elements.
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