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A calcium ion has a +2 oxidation number it has 20 protons and _____ electrons.

A calcium ion has a +2 oxidation number it has 20 protons and _____ electrons.
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A calcium ion has a +2 oxidation number it has 20 protons and _____ electrons.

User Edward Ruchevits
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a calcium ion has 20 protons and 18 electrons.
User ShayD
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