(C) In the periodic table,atomic size decreases from left to right across a period and increases from top to bottom down a group. $Li$ and $Be$ belong

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(C) In the periodic table,atomic size decreases from left to right across a period and increases from top to bottom down a group. $Li$ and $Be$ belong to period $2$,while $Na$ and $Mg$ belong to period $3$. Among $Li$ and $Be$,$Be$ is to the right,so it is smaller. Thus,$Be$ has the smallest atomic size.