Going across a row on the periodic table, left to right, atomic radii decrease.

Name: Going across a row on the periodic table, left to right, atomic radii decrease.
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Question

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As you move from left to right across a period in the periodic table, the atomic number increases, meaning more protons are added to the nucleus, and electrons are added to the same energy level. The increased nuclear charge pulls the electrons closer to the nucleus, decreasing the atomic radius.

Going Across a Row on the Periodic Table, Left to Right