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8 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Who was Aristotle |
400 BC believed that matter was composed of conversations a fire, earth, water, and air |
Avatar |
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Who was Democritus. |
Greek philosopher. Propose that matter was made up of tiny particles I cannot be divided into smaller pieces. He called atomos, meaning invisible |
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Who was John Dalton |
1888 all matter is composed of teeny, and visible particles called Atoms. Atoms can be combined in constant ratios to form new substances. Discovery of subatomic particles Adams are divisible |
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Who was J.J Thompson |
1897. Positive charge evenly distributed in the Atom. Negative charges in bedded in the positive charge. Rutherford's gold foil experiment Atoms cannot have uniform distribution of mass and charge. |
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Who was Ernest Rutherford. |
1911. Positively charged central core or nucleus which has most of the mass. Electrons clubs towards the positive nucleus |
Earth and moon |
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Who was Niel's Bohr |
1912. Energy exist and small units called Quanta. Cannot fully explain Atoms more complex than hydrogen. |
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Who was de Broglie/ Schrodinger |
1930. Electrons have distinct energy levels but exact locations are not defined. |
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Who is Robert Boyle |
1627-1691 particles group together to make different substances |
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