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(Ar) Argon because Ca ion is Ca2+ so it give away 2 electrons

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Krypton is isoelectronic with a calcium ion, as both have 36 electrons. Calcium loses 2 electrons to form a 2+ cation, which results in it having the same electron configuration as krypton.

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9mo ago
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Q: Which noble gas is isoelectronic with a calcium ion?
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