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Where/how do polyatomic ions obtain extra electrons?

Question asked by Gabby Mauldin on Nov 25, 2019
Latest reply on Dec 12, 2019 by Thomas Rizzo

Hi, I am a high school chemistry student (by no means a chemist or professional). I am wondering how polyatomic ions obtain extra electrons/how they are formed. I understand that polyatomic ions are covalently bonded molecules, but I am curious on how they obtain the extra electrons needed to form anions and am struggling to find the answer online. Thank so much!