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First had the idea that matter is made of tiny particles called atoms.
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First believed atoms were indivisible.
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History of an Atom
| Question | Answer |
|---|---|
| First had the idea that matter is made of tiny particles called atoms. | Early Greeks, Democritus |
| First believed atoms were indivisible. | Early Greeks, Democritus |
| They first theorized about atoms more than 2000 years ago | The Early Greeks, Democritus |
| theorized about atoms in the early 1800s | John Dalton |
| Developed the Atomic theory | John Dalton |
| first beleived Atoms of the same element are alike and atoms of different elements are different. | John Dalton |
| Frist Beleived Atoms of different elements can combine to form chemical compounds. | John Dalton |
| Similarities between the Early Greeks and John Dalton: | All matter is made of atoms which are indivisible and indestructible; Atoms cannot be destroyed |
| Atoms of the same elements are the same; atoms of different elements are different. | Atomic Theory |
| Difference between Dalton and Early Greek's theories: | He added the fact that atoms of different elements are different and that they can come together to form compounds. |
| created the "plum pudding model" | J.J. Thompson |
| thought an atom is a ball of positive charge with negatively charged particles (like the chips in chocolate chip cookie dough) | J.J. Thompson |
| First thought Atoms contain smaller particles—electrons | J.J. Thompson |
| Performed the "gold foilexperiment" | Ernest Rutherford |
| First theorized that the positive charge in an atom is found in a small particle (nucleus) which is surrounded by a large area of empty space. | Ernest Rutherford |
| Thompson to Rutherford: what's the same? | Both agreed that atom’s consisted of positively and negatively charged particles. Both agreed that atoms of different elements can combine to form compounds. Both agreed that atoms of the same compound are the same, and atoms of different compounds are di |
| Thompson to Rutherford: what's different? | Rutherford says that electrons orbit around the nucleus ; he also explains the relative sizes of the parts of an atom |
| First theorized negatively charged particles (electrons) move in definite orbits around the nucleus | Neils Bohr |
| helped determine where the orbits are located. | Bohr |
| theorized An atom has a small, positively-charged nucleus (containing protons and neutrons) surrounded by a large region where there are as many negatively-charged electrons as there are protons in the nucleus. | The Modern Model |
| theorized The electrons do not move around the atom in a definite path, but whiz around it in different directions. While there are regions where electrons are more likely to be found (called energy levels or orbitals,) it is impossible to determine the | The Modern Model |
| theorized The electrons go around the nucleus and each electron spins as it moves, like the earth spins. | The Modern Model |
| Bohr to Modern Model: what;s the same? | Both discuss the proton/neutron attractions. Both refer to electron orbits as “energy levels”. |
| Bohr to the Modern Model: What's different? | Bohr said electrons move in a definate orbit; The modern model says they don’t. Bohr’s experiments helped to locate electrons but the modern model says this can’t be done exactly. |
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ElizabethI
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