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Electron affinity
Electron affinity is the energy change when one mole of electrons is added to one mole of gaseous atoms, forming one mole of gaseous 1− ions.
Electronegativity
The ability of an atom to attract a bonding pair of electrons in a covalent bond.
Ionisation energy
Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms.