P4
- Created by: vlad_the_lad
- Created on: 04-10-19 15:32
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- P4
- Plum Pudding Model 1904
- John Dalton
- matter = tiny spheres
- J.J Thompson
- spheres of positive charge, negative electrons
- John Dalton
- Alpha Particle Scattering 1909
- Rutherford
- alpha particles + gold foil, shows nuclei
- mostly empty space, nucleus has +ve charge, small nucleus
- Rutherford
- proton = 1, +1 Neutron = 1,0 Electron = 1/2000, -1
- top number is protons, bottom is protons and neutrons
- ions
- electron added /removed
- isotopes
- same protons, diff. neutrons
- Radiation
- Alpha - 2/4He ionising
- Beta - ionising, penetrating
- Gamma - ionising
- Half-lives (Bq)
- counts per minute/2.../2
- Irradiation (exposure)
- Contamination (dangerous)
- food,sun,rock,medical
- Tracers & radiotherapy
- Fission
- splitting Uranium, neutrons-chain reaction
- Fusion
- joining together to make heavy atom
- Plum Pudding Model 1904
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