what is a phosphate group?Please explain the type of bonds.

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ndnordic eNotes educator| Certified Educator

a phosphate group is a polyatomic ion which contains both ionic and covalent bonds. By definition, a phosphate group is PO4 with a charge of -3. The parent compound is phosphoric acid, H3PO4 which has a structure with the phosphorus in the center, one oxygen double bonded to the phosphorus, and three OH groups also bonded to the phosphorus.  To form the phosphate ion, the phosphoric acid loses three hydrogen atoms when it is dissolved in water.  What remains is a central phosphorus, one oxygen double bonded to the phosphorus, and three oxygen atoms bonded to the phosphorus, each with a charge of -1.