O²⁻
oxide
O²⁻ (oxide ion) is an anion, which means it carries a negative charge. It is formed by the addition of two electrons to a neutral oxygen atom (O).
The oxide ion has a stable electronic configuration of 2s²2p⁶, which is the same configuration as a noble gas (helium, neon, argon, etc.). This makes the oxide ion very stable and unreactive, making it an excellent candidate for ionic compounds.
O²⁻ is commonly found in ionic compounds, such as sodium oxide (Na₂O) or calcium oxide (CaO). In these compounds, the oxide ion acts as a strong base which can react with water to form hydroxide ions (OH⁻).
O²⁻ also plays an important role in biological systems as it is involved in the electron transport chain during cellular respiration. In this process, it accepts electrons and is reduced to water (H₂O).
Overall, O²⁻ is an important ion which is integral in many chemical reactions and biological systems.
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