Answer the following question given this paragraph: 

An electron is a particle outside the nucleus of an atom that has a negative electric charge. The charge of an electron is opposite but equal to the charge of a proton. Atoms have the same number of electrons as protons. As a result, the negative and positive charges "cancel out. " This makes atoms electrically neutral. For example, a carbon atom has six electrons that "cancel out" its six protons.


Q: What is the term for  a particle outside the nucleus of an atom that has a negative electric charge?


A:
electron