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Webalpha particles positively charged particles nuclear model a model which represents nucleons as existing in different energy levels, or shells, in the nucleus nucleons Protons and neutrons mass of a proton 1 AMU mass of an electron .00055 AMU mass of a neutron ~ 1 AMU isotope Atoms of the same element that have different numbers of neutrons WebCrash Course series - Regents Review Unit 1 (NYS Chemistry Regents) - Please view the lecture that reviews the atomic structure unit. Understand I am going i... buy an otter for pet
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