Question

Group 13 elements have less 1st ionization enthalpy than Group 2 elements but
have high 2nd and 3rd ionization enthalpies. Account for the observation.

Answer 1

Answer:

group 2 elements in there last orbital has 2 electrons that is they have stable configuration ns2 therefore the energy required to remove electron is more whereas group 13 elements have electronic configuration ns2 np1 the last electon can be easily removed .

Explanation:

therefore group 13 have less ionisation enthalpy than group 2 .

Answer 2

Answer:

Group 2 elements have ns² configurations which is a stable configuration. So the energy needed to remove the electron is more. Whereas group 13 ns² $np^{1}$ electrons which are easily removed. Thus, the ionization enthalpy of group 13 is lesser than that of group 2.