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Given a scientific passage and an answer, generate a question for the given answer.

Passage: 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. Answer: electron
Output:
What is the term for a particle outside the nucleus of an atom that has a negative electric charge?