1. Which contrast best describes the ancient views of Aristotle and Democritus on matter?
2. What did Dalton propose about matter and chemical reactions in 1803?
3. Which description identifies Thomson’s 1904 atomic model?
How did Aristotle and Democritus differ on matter’s structure?
Aristotle proposed continuous matter without free space; Democritus proposed indivisible particles separated by void.
Which year did Dalton propose that matter consists of atoms combining in chemical reactions?
1803.
Which model did Thomson propose in 1904?
The Thomson pudding, or raisin-bread, model.
Which year did Rutherford propose the planetary model of the atom?
1911.
Which year did Niels Bohr propose his model of fixed electron orbits?
1913.
Which year did Erwin Schrödinger propose an electron-cloud model?
1927.
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