Question

Define: Atomic radius, Ionic radius, Ionisation Enthalpy, Electron Gain enthalpy, Electronegativity.

Answer 1

Atomic radius: The distance from the center of the nucleus to the outermost shell containing electrons.

Ionic radius: It is a radius of an atom's ion in ionic structure. It is denoted by $r_{ion}$.

Ionization enthalpy: It is defined as the minimum amount of energy required to remove the most loosely bound electron, the valence electron of an isolated neutral gaseous atom, molecule or ion.

Electron gain enthalpy: It is energy released when one mole of the electron is added to the gaseous atom of an element.

Electronegativity: It is a measure of the tendency of an atom to attract a bonding pair of electron.