Which of the following is a polyatomic ion?


  1. A N₂
  2. HCl
  3. PO43-
  4. S2

Answer= 3. PO43-

In terms of the word “poly,” which means “many” or “several,” a polyatomic ion is an ion composed of at least two atoms. The atoms of a polyatomic ion are typically linked by covalent bonds, and polyatomic ions can be positively or negatively charged depending on the association or relationship formed by two ions. Phosphate ion is an example of a polyatomic ion (PO43).

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