Where does the positive charge come from on an atom?

Answer 1

If you're talking about just atoms after an ionization process, then cations.

By definition, cations have a positive charge, since they've lost an electron, which itself has a negative charge:

#"M" -> "M"^(+) + e^(-)#

By losing a negative charge, the atom has gained a positive charge.

If you're wondering about what part of the atom... the nucleus is where the positive charge resides. Here is a (simplistic) depiction of the atom, showing the positive charge in the nucleus:

The protons in the nucleus (red) have the positive charge, and such a positive charge arises from the imbalance of protons and electrons - specifically, when the number of protons is greater.

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Answer 2
Avery Adams
An atom's nucleus, which is made up of positively charged protons, is what gives it its positive charge.
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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