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Electron affinity

Ice-cream
in Chemistry

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I'm trying to understand how the trends in a periodic table work for electron affinity. I've read that the electron affinity generally increases across a period from left to right, and decreases down a group but there are exceptions - which means if I have a question asking me for eg. which one, Ar or Br has a more favourable(more exothermic) electron affinity...I don't know whether its one of those exceptions or not. Can any1 explain how else I can figure out which atom has a more favourable electron affinity...electron configurations maybe, I don't know for sure?? I'm really confused.

Thanx.

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