Which option represents the oxide ion?

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Multiple Choice

Which option represents the oxide ion?

Explanation:
The oxide ion is oxygen that has gained electrons to become negatively charged. Gaining two electrons gives oxygen a 2− charge, so the species is written as O2−. This is the common ionic form of oxygen in compounds, especially with metals. The other possibilities would be a positively charged oxygen (loss of electrons), a neutral oxygen atom (no charge), or a much less common three-electron gain (O3−), which isn’t the usual oxide form. So the oxide ion is O2−.

The oxide ion is oxygen that has gained electrons to become negatively charged. Gaining two electrons gives oxygen a 2− charge, so the species is written as O2−. This is the common ionic form of oxygen in compounds, especially with metals. The other possibilities would be a positively charged oxygen (loss of electrons), a neutral oxygen atom (no charge), or a much less common three-electron gain (O3−), which isn’t the usual oxide form. So the oxide ion is O2−.

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