The second ionization enthalpy of alkaline earth metal is less than that of alkali metal .why?

Open in App

Solution

Dear User,
Alkali metals have high second ionisation enthalpy as after losing one electron, alkali metals attain their noble gas configuration and so removal of another electron is difficult and thus second ionisation energy is very high.
Alkaline earth metals have 2 electrons in their valence shell. The second ionisation enthalpy is lower than that of alkali metal because in alkaline earth metal, after removal of one electron, one more electron is present in valence shell which can be removed easily as after its removal the atom will attain noble gas configuration, and therefore their second ionisation enthalpy is low.

Suggest Corrections

Similar questions

Q. The first ionisation enthalpies of the alkaline earth metals are higher than that of alkali metals but second ionisation enthalpies are smaller, why?

The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because ...

Q. Which ionisation energy of alkaline earth metal is less than that of alkali metals?

The first ionization energies of alkaline earth metal are higher than of the alkali metals. Explain.

Compare the alkali metals and alkaline earth metals with respect to (i) ionization enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides.

Join BYJU'S Learning Program