The element having most negative value of electron affinity $(E A)$ is :

C l

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N a

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B a

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S e

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Solution

The correct option is B $C l$
Among the given elements, chlorine has the most negative value of electron affinity.
Moving from left to right in a period, the electron affinity becomes more negative.
Moving from top to bottom in a group, the electron affinity becomes less negative.

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