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Unformatted text preview: AN ION! Sum of the number of protons and neutrons in an atom is = A = mass number, which is the approximate mass of an atom in amu *Z is constant for a given element 63Cu29> 29 protons and 29 electrons; 63-29 = 34 neutrons 25Mg > 12 protons and 12 electrons; 25-12 = 13 neutrons 27Al > 13 protons and 13 electrons; 27-13 = 14 neutrons 1 amu = 1/12 of the mass of the atom that contains 6 protons and 6 neutrons 1 amu- = some obscure number of grams CHE 131 Lecture Notes 09/10/07...
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- Fall '08