Continuation on the history of atoms
Storyboard Text
- Slide: 1
- The atom consists mostly of empty space...
- 1911: Lord Rutherford proposed that the atom consisted mostly of empty space with a dense nucleus containing positively charged protons in the centre. Negatively charged electrons orbited the nucleus. Although Lord Rutherford's model of the atom was essentially the same as today's accepted model , its one flaw was that it proposed that the orbiting electrons would eventually lose energy and spiral in towards the nucleus.
- Slide: 2
- That makes more sense..
- 1913: Niels Bohr, a scientist who studied with Rutherford, modified the model by suggesting that electrons orbit the nucleus at different energy levels. Only electrons with specific amounts of energy could exist at each level. His model proposed that electrons could move from one level to another by gaining or losing 'packets' of energy. Although Bohr's model explained why electrons did not spiral in towards the nucleus, it did not explain all of the known properties of atoms.
- Slide: 3
- I FOUND THE MISSING PARTICLE!!!!!!!!!!!
- 1932: Sir James Chadwick discovered that the nucleus contained particles called neutrons, as well as positively charged protons. Neutrons had no electric charge and a mass about the same as a proton.
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