Number of sub-shell in a shell is equal to the number of shel.
According to Summerfield :
`(n)/(f) = ("Length of major axis")/("Length of minor axis")`.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false
D. If assertion is false but reason is true.

Answer

A

Explanation

(a) `k = 1` to `n` and cannot be zero
:. For fourth shell `k = 1, 2,3, 4,` i.e., four sub-shells.