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| All forms of matter both living and nonliving are made up of a limited number of these building blocks; Elements that cannot be split into a simpler substance by ordinary chemical means |
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| elements designated by one or two letters of the element’s name |
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| when a group of electrons move about certain regions around the nucleus; depicted as simple circles |
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| number of protons in atom's nucleus |
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| atom's sum of protons and neutrons |
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| atoms that have an element that have different numbers of neutrons |
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| forces that hold together the atoms of a molecule or compound |
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| outermost shell on atom containing electrons |
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| when atoms lose or gain one or more valence elctrons |
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| positively charged donor electrons; parts of ionic bonds |
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| negatively charged recipient electrons; parts of ionic bonds |
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| when two or more atoms share electrons; will 1 to up to 3 bonds |
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| when two atoms share unequal amount of electrons |
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| when two atoms share an equal amount of electrons |
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| weakest of the bonds it results from the attraction of oppositely charged part of molecules that can be important links between larger molecules |
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