Worksheet: Atoms, Isotopes, and Ions
In a neutral atom, the number of positive protons equals the number of negative electrons. # Protons = # Electrons. Protons and neutrons both have a mass of 1 amu. The mass of the electron is negligible compared to the mass of the proton and neutron. Thus the mass number, or the mass of the atom, is the sum of the number of protons and neutrons. ................
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