In the physical sciences, an ion (/an, -n/) is a particle that has a non-zero net electrical charge, such as an atom or molecule whose total number of electrons is not equal to its total number of protons. A cation is a positively-charged ion, while an anion is negatively charged. Because of their opposite electric charges, cations and anions attract each other and readily form ionic compounds, such as salts.
Based on the above text, what's the best answer to this question: an anion is any atom or group of atoms with a positive charge?
no