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Polyatomic ions are atoms held together by covalent bonds as a group and that from CHM 1220 at Wayne State University
Â· just now. Report Abuse. I would say phosphate bonds, since it is usually phosphate bonds that hold phosphate groups, that are linked to each other by linked together by covalent bonds. the bond between the second and third phosphate groups. This covalent bond is known as a pyrophosphate bond..