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all matter is composed of tiny particles called atoms |
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| a brilliant school teacher who published the Atomic Theory |
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| particles orbiting the nucleus in a 'cloud' |
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mass and charge of proton |
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| mass and charge of neutron |
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| mass and charge of an electron |
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| the force attracting protons and neutrons to each other so the nucleus stays together |
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| strongest force known to science |
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| force holding electrons to the nucleus |
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| affect of gravity on the atom |
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| the number of protons in an atom |
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| atoms of the same element with different numbers of neutrons |
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| the mass of protons and neutrons in an atom |
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| organizes the elements according to their chemical properties |
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| the father of the periodic table |
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horizontal row on the periodic table there are 7 periods |
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vertical column on the periodic table there are 18 groups elements with similar chemical properties are in the same period |
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the characteristics of metals |
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shiny opaque bendable (malleable) good conductor of heat and electricity |
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| the characteristics of non-metals |
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dull brittle poor conductors of heat and electricity |
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elements having properties of both metals and nonmetals they are weak conductors of electricity and are often used as semiconductors in computer circuits |
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| most of the elements in the periodic table |
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| electrons in the outermost energy level |
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| maximum number of valence electrons in the outer level |
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| atoms trade or share electrons |
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element with a full outer level of electrons 8 valence electrons in the outer level inert - they do not combine with other elements |
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| an atom with 7 protons and 8 neutrons |
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