Atomic Structure
AQA Seperate Science - Physics: Section 2B - Electricity and the Atom.
Mindmap covering:
- The Plum Pudding Theory
- Rutherford & Marsden's experiment on the atom
- The Nuclear Model of an atom
- The Structure of an atom
- Created by: Ellie
- Created on: 17-04-14 09:23
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- Atomic Structure
- Plum Pudding
- JJ Thomson's theory
- Rutherford & Marsden experiment
- Fired a beam of alpha particles at thin gold foil.
- Expected that the positively charged particles would be slightly deflected by the electrons in the 'plum pudding model'
- Result: Most of the particles just went straight through with the occasional one being reflected back.
- Outcome: They realised that an atom had a concentrated mass in the centre (nucleus) This also showed that an atom is mostly empty space.
- Fired a beam of alpha particles at thin gold foil.
- Nuclear Model of an atom
- Nucleus is tiny but makes up the mass of an atom
- Contains protons (positive charge)
- Contains neutrons ( neutral charge
- Has an overall positive charge
- Made up of lots of empty space
- Negative electrons whizz around the outside of the nucleus really fast
- Give an atom its overall size
- Proton : Mass= 1. Charge = +1 Neutrons : Mass = 1 Charge = 0 Electron : Mass=1/2000 Charge = -1
- Nucleus is tiny but makes up the mass of an atom
- Atoms
- Atoms have no overall charge
- An electrons charge is the same as the proton but opposite
- Number of protons = number of electrons in a neutral atom
- If electrons are added the atom becomes a charged particle or an ion
- Plum Pudding
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