electrons - Negatively charged particles of atom, protons - Positively charged particles, neutrons - Neutral particles in the atom, Nucleons - The collective term for neutrons and neutrons, 1 amu - Mass of proton and neutrons, negligible - Mass of electrons, isotopes - Elements of the same elements with different masses, mass number - The total number of neutrons and protons, atomic number - Equals to the number of protons, atomos - Greek word meaning indivisible or indestructible,

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