 | Term | Definition |
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democritus |
suggests that matter was formed by different types of discrete particles and the properties of these particles determine the property of matter |
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john dalton |
atoms are indivisabile and indestructibile, all atoms of a given element are identical in mass and properties, compunds are formed by a combination of two or more different kinds of atoms, and a chemical reaction is a rearrangement of atoms |
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jj thomson |
in 1904 suggested a model of the atom as a sphere of positive matter in which electrons are positioned by electrostatic forces. this is the plum pudding model. in this electrons are spread randomly. |
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ernest rutherford |
the atom had a central positive nucleous surronded by negative orbiting electrons, his model suggested that most of the mass fot he atom was contained in the small nucleous and that the rest of the atom was mostly empty space, he got this idea through gold foil experiment |
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neils bohr |
atom is mostly empty space, positively charged massive nucleous, negatively charged electrons, eloectrons have fixed orbits (fixed energy levels), electrons can become "excited" and move to higher energy levels for brief periods of time or electrons can move down to lower energy levels and emit light. |
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charge cloud model (heisenberg and shrodinger |
this is also called quantum mechanical model, computers calculated the points in space that an electron has the highest probility of occupying. |
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what is the snack analogy for john dalton |
dot |
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what is the analogy breakdown for john dalton |
not a sphere, dont chemically combine to form compunds, you can see it, you can eat it (destroy it) |
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what is the snack analgoy for jj thomson |
chocolate chip cookie |
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what is the snack analogy breakdown for jj thomson |
not a sphere, electron placement not as rand as for chocolate chip, you cans see it, |
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what is the snack analogy for ernest rutherford |
tootsie pop |
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what is the snack analogy breakdown for ernest rutherford |
no stick on atom, no empty space on tootsike pop, tootsie roll portion pretty big compared to lollypop, no electrons in model, mass is not just copntained in center, you can see it |
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what is the snack analogy for neils bohr |
gobstopper |
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what is the analogy breakdown for neils bohr |
nucleous is central most layer but too big, three layers, nothing excited, no empty space, no net charge, you can see it |
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what is the snack analogy for the charge cloud model |
cotton candy with a small steel sphere |
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what is the snack analgoy breakdown for the charge cloud model |
cotton candy is not negatvely charged, does not move around, you can see it |
