Class 11 Chemistry The S Block Elements Ionization Enthalpy and Hydration Enthalpy of alkali metals

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+

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