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12 Cards in this Set
- Front
- Back
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Greeks
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*first contribution to the atom
*said that all matter is made of atoms and that atoms are indestructible |
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Dalton's Atomic Theory
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1. elements made of tiny particles called atoms
2. all atoms of a given element are identical 3. atoms of a given element are different from those of any other element 4. atoms of one element can combine with atoms of other elements to form compounds; a given compound always has the same relative numbers and types of atoms 5. atoms are indivisible in chemical processes; atoms are not created or destroyed in chemical reactions- they change the way atoms are grouped together |
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problems with dalton's atomic theory
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things have changed and we now know that atoms can be subdivided into quarts
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Dalton
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*explained law of constant composition (given compound always has same composition, regardless of where it was found)
*also contributed to meteorology |
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JJ Thomson
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*atoms of any element can be made to emit tiny negative particles
*plum pudding model |
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PLUM PUDDING MODEL!
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*JJ Thomson
*showed protons and electrons scattered within the atom *particles are charged *cation (+) and anode (-) |
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Stony
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coined the term electrodes which led to electrons!
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*Rutherford
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*gold foil experiment
*said that Thomson's model could not be correct because of the large deflections of the partices |
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GOLD FOIL EXPERIMENT!
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*shot particles at gold foil; some went through and other were deflected (measured angle and was able to identufy)
*he concluded that there was empty space within atoms and that they had a nucleus, which held the protons |
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James Chadwick
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*partner to rutherford
*showed that the nucleus contained neutrons also! |
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Neils Bohr
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*quantum theory (of electrons)
*concept of periods and energy levels (2,8,18) where electrons "hang out" *Bohr model of the atom- electrons can be quantumized |
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Heisenburgs Law of Uncertainty
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we dont know the velocity (very fast) of the electrons moving among the principle energy levels (2, 8, 18)- but they do move among then
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