RISE Science - Chemistry Practice Questions - RISE Science - Chemistry (Utah SEEd High School) Exam

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Which general trend best describes atomic radius as you move from left to right across Period 3 (Na to Cl) of the periodic table?

Atomic radius decreases because effective nuclear charge increases, pulling valence electrons closer. Atomic radius increases because additional electrons create stronger electron-electron repulsion. Atomic radius remains constant because electrons are added to the same principal energy level. Atomic radius decreases because nuclear mass decreases across the period.

Correct Answer:

Atomic radius decreases because effective nuclear charge increases, pulling valence electrons closer.

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