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Ammonium sulphate is the compound's name.
NH4 is a polyatomic positive ion {cation} with the charge +1.
SO4 is a negative ion {anion} with the charge  -2
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Ammonium  sulphate is the name of compound..

⇒ NH₄ is the cation with positive charge +1.
⇒ SO₄ is the anion with negative charge -2..
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