Positive ion意思

"Positive ion" or "cation" is a term used in chemistry to describe an atom or a group of atoms that has a positive electrical charge. This charge results from the loss of one or more electrons from the atom or group of atoms during a chemical reaction or process.

When an atom loses an electron, it becomes positively charged because it now has more protons (which have a positive charge) than electrons (which have a negative charge). The number of protons in an atom's nucleus determines the element, while the number of electrons determines the ion's charge.

Positive ions are attracted to negative ions (anions) and can form ionic bonds in compounds. They play a crucial role in many chemical reactions, including those that take place in living organisms and in the operation of batteries and other electrochemical devices.