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Which of the following elements is the least electronegative?A. `S`B. `Cl`C. `Br`D. `Se`

Answer» Correct Answer - D
For the respesentative elements, electro0negativity values ussually increase from left to right across periods (because of decrease of atomic size on account of increase of `Z_(eff))` and decrease from top to bottom within groups (because of increase of atomic size on account of increase in the number of shells). Thus, the order of increasing electronegativity is
`Se lt S lt Br lt CI`
`{:(2.4,2.5,2.8,3.0,):}`


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