Does atomic number increase across a period table?
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The size of an atom usually decreases as we move from left to right for a certain period. Hence, the atomic radius decreases across a period and increases down a group.
In a period, the size of an atom decreases from left to right. This is because the nuclear charge, i.e., the atomic number increases from left to right in the same period, thereby bringing the outermost shell closer to the nucleus.