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13 Cards in this Set
- Front
- Back
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Isotopes |
atoms with the same number of protons but different numbers of neutrons Aluminum-27 |
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Significant Figures- 0.001230400 |
7 |
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Sig Figs- 3400 |
2 |
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Sig Figs- 0.0034 |
2 |
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Chemical Change |
Takes place on molecular level Produces a new substance |
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Physical Change |
Matter takes a different forn |
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Robert Millikan |
Identified negative electrons |
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JJ Thomson |
Electrons |
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Mendeleev |
Periodic Table |
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John Dalton |
Elements are one atom Compounds are 2 or more atoms |
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Rutherford |
Gold foil- discovered |
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Bohr |
Electrons are a certain distance from the nucleus |
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Ion |
7/3 Li +1 Number of electrons not equal to number of protons |
