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Question: Sodium and magnesium which element is bigger?

Answer: As one goes from the left side of the same phase to the right, the number of protons of the element increases. As a result, the number of electrons also increases. As a result, the attraction between more protons in the atom's nucleus and the outer spin electrons is greater. And because of this, the size of the atom decreases and becomes smaller. So we can say that as we go from left to right of the atom the curve gets smaller.

So magnesium (Mg) is to the right of sodium (Na) in the periodic table so magnesium is larger in size.