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Atomic number is the number of protons in an atom. Mass number is the number of neutrons in an atom, and net charge describes how the protons and electrons balance out. Thank 107. Flag lesson. Tip: This isn't the place to ask a question because the teacher can't reply.
An atom is made of positive protons and neutral neutrons in the nucleus, and negative electrons surrounding the nucleus. An normal atom has the same number of protons and neutrons, so the protons and nuetrons cancel each other out, resulting in an overall charge of zero.