CHEMISTRY · Single correct · A Level · Chemistry · Periodicity and periodic trends · Periodicity and periodic trends
Problem
Ionization energy of an element is :
(1) Equal in magnitude but opposite in sign to the electron gain enthalpy of the cation of the element
(2) Same as electron affinity of the element
(3) Energy required to remove one valence electron from an isolated gaseous atom in its ground state
(4) Equal in magnitude but opposite in sign to the electron gain enthalpy of the anion of the element