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Question- Which equation best describes the electron affinity of Cl? (and why?) Having a difficult time understanding the concept of electron affinity.

1) Cl(g) --> Cl+e' Delta E <0

2) Cl(g) --> Cl+ e' Delta E >0

3) Cl(g) + e' --> Cl (g) Delta E < 0

4) cl(g) + e' ---> Cl(g) Delta E >0

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