Question

The set representing the correct order of first ionization enthalpy is a) K > Na > Li b) Be > Mg > Ca c) B > C>N​

Answer 1

The correct order of first ionization energy should be: K < Na < Li. 2) Be > Mg > Ca : Correct. These are 2nd group elements and the order correctly reflects trend in ionization energy.

Answer 2

Explanation:

b)Be>Mg>Ca

ionisation enthalpy decreases down the group