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  • The order of decreasing ionisation enthalpy in alkali metals is (i) Na > Li > K > Rb

The order of decreasing ionisation enthalpy in alkali metals is
(i) Na > Li > K > Rb
(ii) Rb < Na < K < Li
(iii) Li > Na > K > Rb
(iv) K < Li < Na < Rb

Answers (1)

The answer is the option (iii) Li > Na > K > Rb

Effective nuclear charge and ionization enthalpy decrease with increase in the size of the atom down the group.

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