Atomic Structure

Atomic Structure

1. John Dalton

   • (1803) Dalton thought that all matter was made of atoms and that they could not be split, created or destroyed

2. Thomson

   • (1897) Thomson discovers the electron
     • (1904) Thomson created the 'Plum Pudding' model: atoms are spheres of positive charge with negative electrons dotted around inside

3. Rutherford

   • (1911) Rutherford created the 'Solar System' model or the 'Gold Leaf' model: atoms have a positive nucleus surrounded by negative electrons in orbits

4. Bohr

   • (1913) Bohr discovered that electrons occupy shells or energy levels around the nucleus

5. Rutherford

   • (1918) Discovers the proton

6. Chadwick

   • Discovers the neutron