Question

Whose atomic size is more .Sodium ion or magnesium ion.Why?

Answer 1

Sodium, since as we know atomic size decreases along the period.

Sodium is the first member of period 3 while magnesium is second, which which the Na atom is larger than the Mg atom.

This is because the nuclear charge of Mg is greater than that of Na, pulling electrons more strongly and effectively reducing the atomic radius.

Answer 2

I think sodium ion is smaller in  size as compared to magnesium ion