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15 Cards in this Set
- Front
- Back
Atomos |
not to be cut |
|
atomic theory begins and year |
400 BC |
|
how many important scientists made significant advances in the atomic theory |
5 |
|
who originally named the atom |
Democritus |
|
after being named how many years did the atomic theory go ignored |
2000 years |
|
during the time when atomic theory was being ignored what did most people think the four basic elements were |
Earth Wind Fire and air |
|
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 |
|
what do you call two or more atoms/elements when they are joined together |
compounds |
|
Thompson the plum pudding guy also discovered... |
electrons (negative charged subatomic particles) |
|
Rutherford the gold foil nucleus guy also discovered the... |
proton (positive charged subatomic particle) |
|
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 |
|
electrons with high energy are blank from the nucleus |
far |
|
atom |
is the smallest thing and everything is made up of it |