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Magnesium is smaller than calcium because it has less shells of electron although both elements have the same number of valence electrons calcium has one more shell. However sodiums electron configuration is 2.8.1 which gives it three shells of electron- the same as magnesium it also has less protons in it's nucleus so it appears that sodium is smaller than magnesium not the other way around. Hope this helps :)

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June Douglas

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3y ago

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