Stack #59956
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| element | a pure substance that cannot be seperated or broken down into simpler substances by physical or chemical means
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| compound | a pure substance composed of two or more elements that are chemically combined
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| mixture | a combination of two or more substances that are not chemically combined
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| atom | the smallest particle into which an element can be divided and still retain all of the properties of that element
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| proton | the positivley charged particles of the nucleus
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| electron | the negativley charged particles found in all atoms
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| neutron | the particles of the neucleus that have no charge
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| periodic | having a regular, repeating pattern
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| periodic law | a law that states that the chemical and physical properties of elements are periodic functions of their atomic numbers
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| atomic number | the number of protons in the neucleus of an atom
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| atomic mass | the weighted average of the masses of particles in atoms
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| isotope | atoms that have the same number of protons but have different number of neutrons
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| valence electron | the electrons in the outermost energy level of an atom
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| John Dalton | atomic theory
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| Ernest Rutherford | positve charge nucleus, atom mostly empty space electrons travel around the nucleus
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| Niels Bohr | electrons travel in clouds
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| Democritus | 1st to come up with the idea of an atom
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| Dmitri Mendeleev | father of the periodic table, aranged elements by atomic mass
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| Henry Moseley | rearranged periodic table by atomic number
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| J. J. Thomas | small particles in atom
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Created by:
Dramirez
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