Question

Assuming that the number of maximum permissible shells is 5, how many elements would be there in the periodic table?

Answer 1

Assuming that the number of maximum permissible shells is 5.

Then $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^6;Z=54$, so 6th shell not permitted

Only 54 elements would be present in the periodic table