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| Atomic Weight | # of protons and neutrons |
| Atomic Number | # of protons |
| Proton | in nucleus, +1 charge, 1 amu, Goldstein |
| Neutron | in nucleus, 0 charge, 1 amu, Chadwick |
| Electron | outside nucleus, -1 charge, 1/1836 amu, Thompson |
| Isotopes | atoms of an element that have the same atomic # but a different atomic mass |
| Protium | isotope of hydrogen with mass of 1, 1 proton, 0 neutrons |
| Deuterium | isotope of hydrogen with mass of 2, 1 proton, 1 neutron |
| Tridium | isotope of hydrogen with mass of 3, 1 proton, 2 neutrons |
| Modern Standard for Atomic Mass | C-12 is the standard for atomic mass |
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