Mg atom is smaller than Na atom

Dear student 
Please find the answer to your query below:

Atomic size is the property that we are going to use to explain "Mg atom is smaller than Na atom"
Atomic size refers to the radius of an atom, it is the distance from center of the nucleus to the outermost shell. Atomic size decreases along the period (left to right), this is because the nuclear charge increases (as we move left to right along period ) bringing the electron closer to the nucleus and decreasing the radius. 

Hope this information clears your doubts.

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