What is the charge of the ion formed by oxygen, O?

Question

BlackTom AI · Accepted Answer

Examining the question about the ion formed by oxygen (O), we need to consider oxygen's typical electron configuration and valence behavior.
Option -1: This would correspond to gaining one electron to form O^-; however, oxygen is highly electronegative and tends to gain two electrons to complete its outer shell, making -1 an unlikely common oxidation state for oxygen in simple ionic compounds.
Option -2: This corresponds to gaining two electrons to achieve a full valence shell, resulting in the oxide ion O^2-. This is the standard and most stable ion formed by oxygen in many compounds, reflecting its tendency to achieve a noble-gas electron configuration by filling its 2p orbital.
Option -3: An oxidation state of -3 would mean oxygen has gained three electrons, which is not consistent with oxygen’s typical valence pattern and would lead to an unstable or unusual electronic arrangement not seen in common oxidation states for oxygen.
Option +2: A positive charge would indicate loss of electrons, but oxygen is not inclined to lose electrons to form cations; it is much more common for it to gain electrons to fill its valence shell rather than lose them, so +2 is not a plausible oxide ion formation for neutral oxygen.
In summary, the most accurate and commonly observed ion formed by oxygen is the oxide ion with a 2− charge, reflecting its drive to complete its valence shell by gaining two electrons.

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