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vocab chps 12 & 13

Stack #59956

element a pure substance that cannot be seperated or broken down into simpler substances by physical or chemical means
compound a pure substance composed of two or more elements that are chemically combined
mixture a combination of two or more substances that are not chemically combined
atom the smallest particle into which an element can be divided and still retain all of the properties of that element
proton the positivley charged particles of the nucleus
electron the negativley charged particles found in all atoms
neutron the particles of the neucleus that have no charge
periodic having a regular, repeating pattern
periodic law a law that states that the chemical and physical properties of elements are periodic functions of their atomic numbers
atomic number the number of protons in the neucleus of an atom
atomic mass the weighted average of the masses of particles in atoms
isotope atoms that have the same number of protons but have different number of neutrons
valence electron the electrons in the outermost energy level of an atom
John Dalton atomic theory
Ernest Rutherford positve charge nucleus, atom mostly empty space electrons travel around the nucleus
Niels Bohr electrons travel in clouds
Democritus 1st to come up with the idea of an atom
Dmitri Mendeleev father of the periodic table, aranged elements by atomic mass
Henry Moseley rearranged periodic table by atomic number
J. J. Thomas small particles in atom
Created by: Dramirez