Select the correct statement(s).

Options

A. The value of electron gain enthalpy of an element can be -ve or +ve.
B. In the periodic 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 cation

Answer

A, B, D