which one will require more ionozation energy?Mg or c]na?

The ionization energy of an atom is the energy required to remove an electron from a gaseous atom or ion. The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.

Comparing Magnesium (Mg) and Sodium (Na), we can see that Magnesium is to the right of Sodium in the same period (Period 3) of the periodic table. Therefore, Magnesium will require more ionization energy than Sodium.