Question

Assertion (A): Noble gases have higher ionisation energies in their respective periods.

Reason (R): Noble gases have stable closed shell electronic configuration.

Options

• If both A and R are true, and R is the correct explanation of A.

• If both A and R are true, but R is not the correct explanation of A.

• If A is true, but R is false.

• If both A and R are false.

Answer 1

If both A and R are true, and R is the correct explanation of A.

Explanation:

Noble gases possess the highest ionisation energies within their respective periods because their outermost electron shells are entirely filled. This complete valence shell configuration creates an exceptionally stable closed-shell octet state. Because of this maximum stability and strong nuclear attraction, it requires a tremendous amount of energy to disrupt the shell and remove an electron. Therefore, the reason is directly and accurately accounts for the assertion.