why do antimony and bismuth have the same electron affinities?

i need the answer to this question for homework. if u didn't already know elctron affinity is defined as the attraction of an atom for an electron.

aliciaarchives2005-12-30T19:51:19Z

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It's because of the number of valence electrons they have. They are both willing to give 3 electrons away (which is why the have a negative three charge), so they also share the same affinity for electrons.