atom defintions
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| element | a puresubstance that can not be broken chemicaly or phyisacl means
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| compound | a pure substance coposed of two or more elements that are chemically combined
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| mixture | a combination of two or more substaces not combined chemically
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| atom | the smallest particle into which an element can be divided and still retain all of the properteis of that element
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| proton | the positively charged particles of the nucleus
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| electron | the negativly charged particles found in the nucleus
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| neutron | the particles of the nucleus that have no charge
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| periodic law | a law that states that the chemical and physical properties of elements are periodic functions
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| atomic numbers | the number of protrons in the nucleus
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| atomic mass | the weighted average the masses of all naturaly occuring isotopes of an element
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| isotope | atoms that have the same nuber of protrons but difrent number of nutrons
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| valence electrons | the electrons in the outermost enrgy level of the atom
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| john dalton | atom theory
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| JJ Thomson | small particles in atom
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| ernest rutherford | positive charged nucleus, atom mostly empty space electrons travel around nucleus
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| niels bohr | electrons travel in clouds
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| democritus | 1st to come up with idea of atom
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| dmiti mendelev | father of the periodic table, arrange elements by atomic mass
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| henry moseley | reaganged periodic table ny atmoic number
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