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Chemistry
Atoms
| Question | Answer |
|---|---|
| Democritus | Proposed the idea that the earth is made of invisible particles that could not be devided. He had no proof. |
| atom | smallest particle that has the same properties as its element |
| Dalton's theory | 1. all matter is composed of atoms 2. atoms cannot be devided 3. all atoms of the same element are the same 4. atoms can form compounds |
| Nucleus | Center of the atom containing all mass, neutrons and particle. |
| Proton | positive particles that make elements different. Fond in the nucleus. |
| Neutrons | Neutral particles in the nucleus. |
| Bohr's model | modern atom model |
| orbital | path of electron. |
| Atomic number | number of protons in the nucleus. |