If in nature they may not be an element for which the principle quantum number `n gt 4`, then the total possible number of elements will be

Options

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

Answer

A

Explanation

If`n=1, 2n^(2)=2`
`n=2, 2n^(2)=8`
`n=3, 2n^(2)=18`
`n=4, 2n^(2)=32`
Total number of elements=60