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15 Cards in this Set
- Front
- Back
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When was the electron discovered? |
The electron was discovered in 1897 |
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Who discovered the electron? |
JJ Thomson discovered the electron |
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Who discovered the neutron? |
James Chadwick discovered the neutron |
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When was the neutron discovered? |
1932 |
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What did Rutherford fire at the gold leaf? |
Alpha particles (the nucleus of helium) |
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How thick was the gold leaf. |
The gold was one atom thick |
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Who proposed the nuclear model? |
Niels Bohr was the first to propose the nuclear model |
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What is the size of the electron? |
The electron is 10^-15 metres |
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State the plum pudding model |
Positively charged large "pudding" Negatively charged electrons in the pudding like "plum"s |
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State the conclusion of Rutherford's Gold Scattering experiment |
It was found out that the majority of the atom was empty space and it had a dense centre named the nucleus |
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State the results of Rutherford's Gold Scattering experiment |
Most of the alpha particles went straight through however a small amount (about 1 in a million) bounced back. The path of other alpha particles were deflected. |
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What is the nuclear model |
It is a model that states the electrons orbit the nucleus at specific distances. These are called energy levels or shells |
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What is the radius of an atom? |
The radius of an atom is 0.1nm |
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What is the radius of a nucleus? |
The radius of a nucleus is about 10^-15m |
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Why was Bohr's model accepted? |
Bohr's model was accepted because it agreed with the experiments of other scientists |
