Ionization Enthalpy and Hydration Enthalpy of alkali metals
- Ionization energy is the quantity of energy required to remove loosely bound electron from an atom.
- Down the group ionization enthalpies of alkali metals decreases.
- Increase in atomic number increases the size of the element which in turn outweighs increasing nuclear charge. Therefore the outermost electron experiences strong screening effect from the nuclear charge.
- The energy released as a result of the formation of new bonds between ions and water molecules is called hydration enthalpy.
- In alkali metals the hydration enthalpies decreases with the increase in ionic sizes.
Li+> Na+ > K+ > Rb+ > Cs+