The particle model
- Created by: Iz6379
- Created on: 02-06-19 11:27
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- The particle model
- Chemical and physical changes
- Chemical changes are difficult to reverse and new substances are made
- Physical changes are reversible and no new substances are made
- E.g.- Methane+oxygen ->carbon dioxide +water
- Atomic structure
- Two oxygen atoms joined together=oxygen molecule
- Ions- Atoms/groups of atoms that have lost/gained electrons
- Isotopes are atoms of an element with the same number of protons and electrons and different numbers of neutrons
- Developing the Atomic Model
- 1803- Dalton's solid atom , electrons discovered
- 1897- Thompson's Plum Pudding Model, nucleus discovered.
- Sphere of positive charge with electrons embedded
- 1909- Rutherford's planetery model, mathematical model
- 1913- Bohr's energy levels model; proton, then neutron discovered
- Chemical and physical changes
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