Question

Why ionization energy of MG is more then NA?

Answer 1

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Ionization energy is the energy needed to remove one of the outermost (valence) electrons from an atom. The more stable the electron is in the atom, the more difficult it is to remove from the atom and the higher the ionization energy is. The valence electrons in magnesium are more stable than sodium mainly because magnesium has one more proton in the nucleus than sodium does. So even though the valence electrons of magnesium are in the same type of orbital (3s) as sodium, they are more attracted to the more positive nucleus and therefore are harder to remove.

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