Question

Why is the first ionisation enthalpy of Mg higher than Al?
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Answer 1

Answer:

thus Mg has the first ionisation enthalpy higher than that of Al due to the fulfilled s-orbital of Mg which requires higher energy to remove the electron from the outermost shell and on the other hand Al can easily lose one electron as p-orbital has only one electron.

Answer 2

Explanation:

thus Mg has the first ionisation enthalpy higher than that of Al due to the fulfilled s-orbital of Mg which requires higher energy to remove the electron from the outermost shell and on the other hand Al can easily lose one electron as p-orbital has only one electron