ions made with more than one atom- H₂O (water)- NH₃ (ammonium)- CH₄ (methane)*use parenthesis with more than one polyatomic ion

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1. ions made with more than one atom
- H₂O (water)
- NH₃ (ammonium)
- CH₄ (methane)
*use parenthesis with more than one polyatomic ion