The cation energy of an electron is largely determined by its principal quantum number.
The principal quantum number `n` is a measure of the most probable distance of finding atomic the electron around the nucleus.

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) We know that principal quantum number represent the main energy level or energy shell. Since each energy level is associated with a definite amount of energy. This quantum numbers determines to a large extent the energy of an electron. It also determines the average distance of an electron around the nucleus. Therefore both assertion and reason are true and the reason is the correct explanation of the assertion.