________ element has one electron in the outermost shell and attains duplet configuration after accepting one more electron and attains stability.

Helium

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Hydrogen

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Lithium

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Carbon

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Solution

The correct option is B Hydrogen
Hydrogen has ${1 e}^{-}$ in outermost shell, in order to achieve stability either $e^{-}$ to be removed or added. When added it acquires a stable configuration forming duplet.

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________ element has one electron in the outermost shell and attains duplet configuration after accepting one more electron and attains stability.

The correct option is B HydrogenHydrogen has 1e− in outermost shell, in order to achieve stability either e− to be removed or added. When added it acquires a stable configuration forming duplet.

The correct option is B Hydrogen
Hydrogen has ${1 e}^{-}$ in outermost shell, in order to achieve stability either $e^{-}$ to be removed or added. When added it acquires a stable configuration forming duplet.