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14 Cards in this Set
- Front
- Back
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Who discovered that the center of the atom was a very small and dense with an overall positive charge in his gold foil experiment |
Ernest Rutherford |
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The subatomic particle with a positive charge is called the ... |
proton |
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the ... is always equal to the number of protons + the number of neutrons that the atom has |
mass number |
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an atom that gains an electron will have a ... charge |
negative |
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According to Dalton, atoms of different elements will be ... |
different |
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the ... of an element is the weighted average of the masses of the different isotopes of that element |
Atomic mass |
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both the neutrons and the ... are found in the atoms nucleus |
protons |
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the proton has a mass of approximately ... |
1 amu |
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Thomson discovered the ... in his cathode ray experiment |
electron |
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... are atoms that have the same atomic number but different mass numbers |
isotopes |
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Democrats said that ... were indivisible, fundamental units of matter |
atoms |
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an anion is an atom with an overall ... charge |
negative |
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an atom gets an overall positive charge by ... ... |
loosing electrons |
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Explain the 4 major points of Dalton's atomic theory |
1- All elements are composed of atoms 2-atoms of the same element are identical 3-atoms of different elements mix or combine in whole number ratios 4- chemical reactions occur. In a chemical reaction, atoms of one element NEVER change into another |
