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| Average Atomic Mass |
weighted average of the atomic masses for all known isotopes |
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| Atomic Mass unit |
AMU mass of a proton or neutron |
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| Nuclear Symbol Notation |
Mass # over Atomic # Element symbol |
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| Hyphen Notation |
Name-Mass# |
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| Isoptopes of H |
Protieum, Deuterium, Titium |
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| Tritium |
one proton, 2 neutrons, one election |
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| Deuterium |
one proton, one neutron, one electron |
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| Protium |
one proton only |
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| Mass Number |
total of protons & neutrons |
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| Nuclide |
general term for any isotope of an element |
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| Isotope |
atoms of hte same element with varying neutrions |
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| Atomic Number |
number of protons in the nucleus |
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| Forces in the nucleus |
Nuclear Forces
forces that hold nuclear particles together |
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| Ernest Rutherford |
discovered nucleus with the gold foil experiment |
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| JJ Thomson |
discovered electron with Cathode-Ray Tube |
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| Cathode-Ray Tube |
vacuum tube containing electron gun |
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| Modern Attomic Theory |
all matter is composed of atoms
atoms of one element differ in properties from atoms of another element |
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| Law of Multiple proportions |
If two or more compoueds are composed of the smae 2 elements the masses can be expressed as ratios of small whole numbers |
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| Law of Definite proportions(Law of Def. Composition) |
chemcal compounds contains the same elements in exactly the same proportions by mass regardless of size |
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| Law of Conservation Mass |
mass is neither created or destroyed in ordinary chemical rxns |
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| Chemical Reaction |
transformation of substances into 1 or more new substances |
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| Aristotle/Plato |
disagreed with Democrotus theory |
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| Democritus |
said an atom cannot be divided anymore |
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