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Periodic table periodic table molar mass4/10/2024 The vast majority of the atomic mass is contributed by the protons and neutrons.įor any element in the periodic table, the number of electrons in an atom of that element always equals the number of protons in the nucleus. The mass of the proton and neutron are about the same, but the mass of the electron is much smaller (about 1/2000 the mass of the proton or neutron). The atomic mass of an element is based on the mass of the protons, neutrons, and electrons of the atoms of that element.
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