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Magnesium atom is smaller than calcium atom. Why ?

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 Magnesium atom is smaller than calcium atom. Why ?

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Magnesium atom precedes calcium atom in the same group, i.e., group 2. Magnesium atom has got three electron shells (2, 8, 2) whereas calcium atom has four electron shells (2, 8, 8, 2). So, calcium atom is larger than the sodium atom.

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