Question

Which of the following statements is INCORRECT?

विकल्प

• Atomic radii of alkaline earth metals are smaller than alkali metals.

• First ionization enthalpies of alkaline earth metals are higher than alkali metals.

• Second ionization enthalpies alkaline earth metals are higher than alkali metals.

• Oxides of alkali metals are highly basic while the oxides of alkaline earth metals are weakly basic.

Answer 1

Second ionization enthalpies alkaline earth metals are higher than alkali metals.

Explanation:

Alkaline earth metals have lower second ionization enthalpies than alkali metals because alkaline earth metals have two valence electrons while alkali metals have one.