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13 Cards in this Set
- Front
- Back
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atomic number |
the number of protons in the nucleus of each atom of an element |
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mass number |
total number of protons and neutrons in an atom |
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a-z notation |
shorthand notation of the composition of any atom using the atomic number (z) and the mass number (a) |
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isotopes |
atoms that have the same atomic number but different mass numbers due to a difference in the number of neutrons |
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mass spectrometer |
an instrument that determines the masses of atoms, molecules, and molecular fragments |
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percent abundance |
the percentage of atoms of a particular isotope in a naturally occurring sample of the pure element |
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atomic mass |
the weighted average of the atomic masses of the naturally occurring isotopes of an element |
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electron |
a negatively charged particle that has a very small mass |
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plum pudding model |
an experiment led by j j thompson which proposed that the atom was comprised of negatively charged particles i a field of positively charged particles |
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radioactivitiy |
when certain substances emit charged particles |
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gold foil experiement |
an experiment led by emest rutherford which proposed that atoms consist of a small positively charged nucleus surrounded by negatively charged electrons |
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proton |
a positively charged particle that has a relatively large mass compared to electrons. protons can be found in the nucleus |
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neutron |
an uncharged particle with a mass nearly equal to that of the proton. neutrons can be found in the nucleus |
