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OpenStudy (anonymous):
A monatomic ion with a charge of -2 has an electronic configuration of 1s22s22p6.
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OpenStudy (ipwnbunnies):
It might be Oxygen, but I'm really not sure b/c I don't know if monatomic O ion exists by itself. Or maybe I'm just thinking too hard. D:
OpenStudy (ipwnbunnies):
I mainly think O b/c a neutral Oxygen atom is 1s22s22p4, so adding those two electrons to the p orbital would make it stable.
OpenStudy (kc_kennylau):
Monoatmoic O ion is found in MgO aka magnesium oxide
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