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13 Cards in this Set
- Front
- Back
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compared to the entire atom,the nucleus of an of the atom is |
smaller in contains most of the atoms mass |
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which particle has the least mass? |
electron |
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proton neutron electron |
positive neutral negative |
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mass number |
=number of P + N |
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discover the electrons using a device known as cathode ray tube |
J. J Thompson |
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Ernest Rutherford |
Gold foil experiment discovered the nucleus of the atom |
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John Dalton |
First person to scientifically studied the idea of an atom. |
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most the Apple particles pass through the gold foil |
The atom is mostly empty space |
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few alpha particles were deflected (went off at an angle) |
The nucleus is positively charged |
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very few alpha particles were reflected back |
nucleus is dense and small |
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Nucleons |
n + p |
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charge of atom |
p + e |
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calculating average atomic mass |
% X mass + % X mass |
