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Unformatted text preview: -Atom consists of a nucleus surrounded by a could of electrons-Nucleus contains protons and neutrons Proton- mass is 1 amu Neutron- mass is 1 amu Electron- mass is vey small Z = atomic number =number of protons= number of extranuclear electrons for a neutral atom N= number of neutrons A= mass number (atomic weight) = Z+N Isotopes:...
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- Fall '07