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What is the electronic configuration of ...

What is the electronic configuration of `O^(2-)` ion?

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The correct Answer is:
A
a.`H^(Theta) = 1s^(2)` b. `Li^(o+a)` = ls^(2)` c. `F^(Theta) = 1s^(2)2s^(2)2p^(6)`
`d. N^(2+) = 1s^(2)2s^(2)2p^(1)`
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CENGAGE CHEMISTRY ENGLISH-ATOMIC STRUCTURE-Exercises (Subjective)
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  3. What is the electronic configuration of O^(2-) ion?

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