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Oxygen Ion: -1 charge

Sulfur Ion: Neutral charge

Explanation:

Protons always have a + charge.

Electrons always have a - charge.

Oxygen:

If we have 8 protons and 9 electrons, we can see that we would only have +8 charge vs a -9 charge. Therefore:

8 - 9 = -1 charge overall

Sulfur:

If we have 16 protons and 17 electrons, we can see that we would have an overall charge of -1:

16 - 17 = -1 charge overall

However, since we lost an electron, we now only have 16 electrons:

16 - 16 = 0 charge, or neutral overall