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It will gain an electron so that it can complete a full outer shell of 8 electrons.

Q: When a valance shell has 7 electrons will it gain or lose an electron?

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It will gain an electron so that it can complete a full outer shell of 8 electrons.

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Inert gases

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tries to form the nearest complete electron shell

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because oxygen needs 2 electron to complete it's valance shell. Whereas hydrogen does not want to complete it's valance shell, it wants to lose its electron.

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oxygen has 6 valence elctrons and needs two more to complete its electron shell and hydrogen is just what it needs hydrogen has one electron which makes a complete electron shell for oxygen.

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