Outermost electronic configuration of least electro negative element in the periodic table is

2s²2p⁵

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3s²3p⁶

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2s²2p⁴

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6s²6p⁶7s¹

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Solution

The correct option is D
6s²6p⁶7s¹

Elements with 1 electron in the outermost shell are highly electro positive as they have tendency to lose an $e^{-}$ and attain inert gas configuration

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