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What noble-gas element has the same number of electrons as each of the following ions? O2-, P3-, Ca2+, K+

What noble-gas element has the same number of electrons as each of the following ions? O2-, P3-, Ca2+, K+
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What noble-gas element has the same number of electrons as each of the following ions?

O2-, P3-, Ca2+, K+

User Martin Fasani
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Argon, as all of the ions have 18 electrons. 
User TerrorAustralis
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