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Na (Sodium) has a +1 charge. Kazyan: See above, but some exotic chemistry has produced sodium ions that are negative: -1.
The net charge of an atom is how the electrons and the protons balance out. If there an equal number of protons and electrons then it will have a net charge of 0. If there was more electrons than protons then it would have a negative charge overall. Flip that around and you get a positive charge.