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| the smallest particle of matter; too small to see |
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| positively charged particle; in the nucleus or the center of the atom |
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| uncharged particle; in the nucleus or the center of the atom |
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| negatively charged particle; moves around the nucleus of the atom |
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| negative or positive electric charge |
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| amount of matter in an object |
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| neither positively or negatively charged |
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-number of protons in the nucleus
-same for each atom of an element
-number at the top of the square in the periodic table |
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-average mass of all the element's isotopes
-number at the bottom of the square in the periodic table |
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| atoms of the same element that have different numbers of neutrons |
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-table of elements
-created by Mendeleev in 1869
-arranged into groups and periods |
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-vertical columns of elements on the periodic table
-share similar properties
-read from top to bottom |
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-horizontal rows on the periodic table
-increas by one proton and one electron
-read from left to right |
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