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  4. If elements with principal quantum number n > 4 were not allowed in nature, the number of possible elements would be

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Q. If elements with principal quantum number $n > 4$ were not allowed in nature, the number of possible elements would be

IIT JEEIIT JEE 1983

Solution:

The maximum number of electrons in an orbit are $2n^2$. If
$n > 4$, is not allowed, then the number of maximum electrons
that can be in first four orbit are :
$2 (1)^2 + 2(2)^2 + 2(3)^2 + 2(4)^2 = 2 + 8 + 18 + 32 = 60$
Therefore, possible e' ments can be 60.