Question

Which of the following is INCORRECT for alkali metals?

विकल्प

• Li < Na < K < Rb < Cs (Atomic radii)

• Li < Na < K < Rb < Cs (Ionic radii)

• Li > Na > K > Rb > Cs (Melting point)

• Li < Na < K < Rb < Cs (Ionization enthalpy)

Answer 1

Li < Na < K < Rb < Cs (Ionization enthalpy)

Explanation:

Moving down the group, the ionization enthalpy of alkali metals drops. As a result, Li > Na > K > Rb > Cs is the order.