P1.1 The Particle Model
- Created by: Jadeprigtale
- Created on: 04-11-18 15:57
View mindmap
- P1.1 The Particle Model
- John Dalton
- Did experiments to measure how elements combined
- His model of an atom was a small indestructible sphere
- He thought that:
- All the atoms in an element are the same
- The atoms in one element are different from the atoms in all other elements
- J.J. Thomson
- He was investigating rays given out by hot metals called cathode rays, not atoms
- He discovered the negatively charged electron that come from inside the atom
- Came up with the plum pudding model of the atom
- The atom consists of a positive mass
- The atom has negatively charged electrons embedded in it
- Ernst Rutherford
- Discovered some materials emit alpha particles which are positive
- Shot fire alpha particles at a piece of gold foil
- Some of the particles rebounded
- Showed that there is something positive in the middle of an atom
- Came to the conclusion that there is a nucleus in the middle of an atom
- Nucleus is made of protons and neutrons
- Came to the conclusion that there is a nucleus in the middle of an atom
- Showed that there is something positive in the middle of an atom
- Some of the particles went straight through
- Showed that an atom is mostly empty space
- Some particles were absorbed
- Showed that there were electrons
- Some of the particles rebounded
- Help from two younger scientists, Geiger and Marsden
- Niels Bohr
- Problem with Rutherford's model is the electrons would've been expected to spiral into the nucleus
- Suggested that electrons can only move in fixed orbits
- Electron shells
- John Dalton
Similar Physics resources:
Teacher recommended
Comments
No comments have yet been made