On moving from left to right in a periodic table, the size of the atom ______.

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On moving from left to right in a periodic table, the size of the atom decreases. Explanation: When moving from left to right across a period in the periodic table, the atomic size decreases. This happens because the number of protons in the nucleus increases, which increases the nuclear charge. This stronger positive charge pulls the valence electrons closer to the nucleus, effectively shrinking the atom’s radius.

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