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Unformatted text preview: atom Particles in the Nucleus Proton Positively charged particle ( + ) Number of protons in the nucleus for a particular element is always constant (and fixed) The number of protons ranges from 1 ---> 108 from which the atomic number is assigned. An element is defined by its number of protons. Each proton has a relative mass of "1" (For biology purposes, this is fine. It's actually 1 dalton, which is a relative measure of the mass of the hydrogen atom). Neutron No electrical charge Mass of "1" (just a tiny bit heavier than the proton; not enough for us to be concerned about). About the same number of neutrons as protons/atom, although the ratio changes with larger atoms. .. The number of neutrons plus the number of protons gives the atomic mass (or atomic weight) of an atom....
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- Spring '10