What are polyatomic ions? Give examples for Class 9.
ChemistryClass 9CBSEAnswered 28 May 2026
Answer
A polyatomic ion is a group of two or more atoms covalently bonded together that carry an overall electric charge.
Common Polyatomic Ions:
| Ion Name | Formula | Charge |
|---|---|---|
| Ammonium | NH₄⁺ | 1+ |
| Hydroxide | OH⁻ | 1− |
| Nitrate | NO₃⁻ | 1− |
| Sulphate | SO₄²⁻ | 2− |
| Carbonate | CO₃²⁻ | 2− |
| Phosphate | PO₄³⁻ | 3− |
Polyatomic ions are charged groups of bonded atoms that act as a single unit in forming ionic compounds.
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