If elements with principal quantum number `n gt 4` were not allowed in nature, the number of possible elements would have been

Options

A. 32
B. 60
C. 64
D. 4

Answer

B

Explanation

No. of elements=`2n^(2)`
For n=1 no. of elements=2
n=2 no. of elements=8
n=3 no. of elements=18
n=4 no. of elements=32
Total no. of elements=60.