Which of the following statement is correct.

Options

A. For potassium the atomic radius `lt` ionic radius, but for bromine, the atomic radius `gt` ionic radius.
B. Decreasing order of size is `S^(-2) gt Cl^(-) gt K^(+) gt Ca^(+2)`.
C. The first ionisation potential of `Mg` is less than the first ionisation potential of `Al`.
D. Order of electron gain enthalpy (negative sign) is `F gt Cl gt Br gt l`.

Answer

B

Explanation

Refer notes