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Topic 1.7 · Periodic Trends

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AP Chemistry · Topic 1.7: Periodic TrendsOpen topic

Original PrepAtlas question. This is not an official College Board question.

Three neutral atoms, Na, Mg, and Al, are located consecutively in Period 3 of the periodic table. Which ordering correctly represents their atomic radii from largest to smallest, and why?

AAl > Mg > Na, because atomic radius increases as the number of protons increases across a period.BMg > Na > Al, because magnesium has a completely filled 3s subshell.CNa > Mg > Al, because increasing nuclear charge across the period attracts the valence electrons more strongly while the number of occupied principal energy levels remains the same.DNa > Al > Mg, because aluminum's additional 3p electron causes its atomic radius to exceed magnesium's.

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Topic 1.7 · Periodic Trends

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