Here's why:

* Protons: Positively charged particles found in the nucleus of an atom.

* Electrons: Negatively charged particles that orbit the nucleus.

* Neutral Atom: An atom with an equal number of protons and electrons, resulting in a net charge of zero.

* Anion: An atom that has gained one or more electrons, leading to a negative charge. Since it has more electrons than protons, the negative charge outweighs the positive charge.

Example:

* Chloride ion (Cl-): A chlorine atom gains one electron, making it have 18 electrons and 17 protons, resulting in a net charge of -1.

Let me know if you have any other questions!