Predict the electronic configuration in the oxide ion in CaO. A) [He]2s²2p⁶ or [Ne] B) [He]2s²2p⁵ C) [He]2s²2p⁶3s² D) [Ne]3s¹3p³ E) [Ne]3s²3p³

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The oxide ion (O^2-) has gained two electrons compared to a neutral oxygen atom, resulting in a total of 10 electrons. The electronic configuration of a neutral oxygen atom is [He] 2s^2 2p^4. When it gains two electrons, it fills the 2p orbital, resulting in the configuration [He] 2s^2 2p^6, which is equivalent to the noble gas neon ([Ne]).

Predict the Electronic Configuration in the Oxide Ion in CaO