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| any substance with only one kind of atom |
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| any form of matter with identifyable properties and characteristics |
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| chemical combination of 2 or more elements |
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| 2 or more types of matter physically combined |
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grew a willow shoot for 5 yrs. he weighed the potting soil with the willow shoot in it and weighed a pot with just damp soil and both pots weighed the same. somehow the plant took water and turned it into plant. |
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| priestly experimented with different airs. discovered oxygen but did not name it. |
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| stahl experimented with combustion (burning). "phlogiston" is the substance once thought to be needed for combustion (before the term "oxygen" was coined). |
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| stole all of Priestly's work on combustion, named "oxygen," became rich and famous. |
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| did work with air pressure, "corpuscles." |
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protons have a ___ charge |
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| neutrons have a ___ charge |
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| electrons have a ___ charge |
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| # of protons in an element |
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| average weight of all the isotopes of a given element |
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| any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties |
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| how do you tell how many electrons in an atom? |
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| collection of negative particles surrounding positive and neutral charges |
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| for an atom to be "happy" there has to be 8e- in the outer shell |
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| came up with the periodic table |
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| the line on the periodic table |
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| separates the metals from the nonmetals |
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| 4 groups on the periodic table |
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| alkali metals, alkali earth metals, halogens, and noble gases |
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