Question

The order of decreasing ionization enthalpy in alkali metals is (a) Na > Li > K > Rb (b) Rb < Na < K < Li (c) Li > Na > K > Rb (d) K < Li < Na < Rb​

Answer 1

Explanation:

(c) Ionization enthalpy decreases with increase in Size of the atom in a group. Hence, the order is:

Li > Na > K > Rb.