Which of the following hast he most negative electron gain enthalpy?

B r

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S n

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C a

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M g

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Solution

The correct option is A $B r$
Generally, non-metals have more negative electron gain enthalpy than metals. This is because they gain electrons to comple their outermost orbital. Here, the rest elements are metals, Therefore, $B r$ has the most negative electron gain enthalpy.

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