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An atom may have a positive charge, a negative charge, or no charge. If it has a non-zero charge, it is said to be an ion.
ammonium has a positive charge
BaSO4 is barium as well as a sulfate anion. The overall charge of BaSO4 includes a +2 charge for barium, and a -2 charge for the sulfate anion.
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It is a negative charge