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15 Cards in this Set
- Front
- Back
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Atomos |
not to be cut |
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atomic theory begins and year |
400 BC |
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how many important scientists made significant advances in the atomic theory |
5 |
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who originally named the atom |
Democritus |
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after being named how many years did the atomic theory go ignored |
2000 years |
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during the time when atomic theory was being ignored what did most people think the four basic elements were |
Earth Wind Fire and air |
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in the 1800's what did Dalton do that finally led people to accept the idea of the atom |
he performed a number of experiments that gave proof |
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what do you call two or more atoms/elements when they are joined together |
compounds |
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Thompson the plum pudding guy also discovered... |
electrons (negative charged subatomic particles) |
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Rutherford the gold foil nucleus guy also discovered the... |
proton (positive charged subatomic particle) |
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Niels Bohr the Danish guy discovered that electrons occupy specific |
energy levels |
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from the modern atomic theory what do we call the area where atoms are likely to be found |
the electron cloud |
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electrons with low energy are blank to nucleus |
close |
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electrons with high energy are blank from the nucleus |
far |
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atom |
is the smallest thing and everything is made up of it |
