Magnesium atom is smaller than sodium atom. Why ? – InterviewSolution

1.	Magnesium atom is smaller than sodium atom. Why ?
Answer» Magnesium come after sodium in the same period. Atoms of both elements have three electron shells (Na : 2, 8, 1 : Mg : 2, 8, 2). But the nuclear charge of sodium is + 11 and that of magnesium is + 12. Hence, the electron shells are pulled inward more strongly in Mg atom than in Na atom. Hence, Mg atom is smaller than Na atom.

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