Good question, Yandel. An atom can be neutral, positive, or negatively charged depending on how many electrons and protons it has. Atoms that have a charge(not neutral) are called ions . If there are more electrons than protons, it will be negatively charged, and called an anion. The process of ionizing happens most commonly through interactions with other atoms. When atoms bond, they will either lose or gain electrons, and as I already said, an atom that gains electrons will become negatively charged.
Hope this helps!
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