Select the correct statement(s)

Options

A. The value of electron gain enthalpy of an element can be -ve or +ve .
B. In the perodic table , metallic character of the elements increases down the group and decreases across the period
C. the `Cl^(-)` & `S^(2-)` are isoelectronic species but first one is not smaller in size than the second
D. Ionization enthalpy of an atom is equal to electron gain enthalpy of its cation .

Answer

A, B, D