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Outer electronic configuration of element with highest electronegativity is

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2s²2p⁵

3s²3p⁵

2s²2p⁴

3s²3p⁴

answer is B.

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Detailed Solution

All the Group 17 elements have outermost ns²np⁵ configuration.

The electronic configuration represents:
2s²2p⁵= fluorine = most electronegative element
3s²3p⁵ = chlorine
4s²4p⁵ = bromine
5s²5p⁵ = iodine

In a group from top to bottom electronegativity decreases.

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