Particle Theory Mindmap

Particle Theory Mindmap

1. JJ Thomson

   • Created the 'Plum Pudding Model' in 1904.
     • Idea of the model was that there were rings of negative electrons (plums) in a sphere of positive charge (pudding).
   • The model was proposed soon after the discovery of the electron

2. John Dalton

   • Proposed ideas that...
     • All matter is made of atoms and the atom cannot be broken down into anything smaller
     • Atoms are rearranged in a chemical reaction
     • All atoms of the same element are all identical but different to atoms of other elements
     • Compounds are formed when two or more kinds of atom join together

3. John Jacob Berzelius

   • Proposed ideas that...
     • All atoms are spherical
     • All atoms are the same size
     • Atoms have different weights
     • Atoms are joined together in fixed proportions by an electrochemical reaction.
     • Some atoms are positive and some are negative

4. Ernest Rutherford

   • The atom is mainly made of empty space
   • The mass of the atom is concentrated in the nucleus
   • The nucleus has a positive charge
   • Electrons move around the atom
   • The atom has an overall neutral charge

5. Niels Bohr

   • Discovered that electrons are arranged in shells.
   • Also said that the electrons will determine the reactivity

6. James Chadwick

   • Discovered the neutron in atoms
   • Present day model and what we use now

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