Question

why the second ionization enthalpy is greater than the first ionization enthalpy​

Answer 1

Explanation:

The second ionization energy of Mg is larger than the first because it always takes more energy to remove an electron from a positively charged ion than from a neutral atom. ... The first ionization energy of aluminum is smaller than magnesium.

I hope you understand .

Answer 2

Explanation:

second ionization enthalpy is greater because atom gets stable after first ionization enthalpy (easily being done so as to become stable atom) and do not accet the electron further.

It canbe seen in Na atom.