development of model of atom

• give order of atomic model theories

  1. modern atomic theory
  2. plum pudding model
  3. nuclear model
  4. orbital model
  5. proton discovery
  6. neutron discovery
• describe modern atomic theory

  atoms as indivisible spheres
• describe plum pudding model

  jj thompson - discovery of electron, positive sphere with embedded electrons
• describe nuclear model

  ernest rutherford - alpha scattering particle experiment and concentrated central positive mass
• describe alpha scattering experiment

  alpha particles fired at gold sheet

  expected - pass straight through

  result - deflected
• describe orbital model

  neils bohr - electrons orbit nucleus at specific distances
• describe proton discovery

  ernest rutherford - nucleus divided into smaller positive particles
• describe neutron discovery

  james chadwick - nucleus divided into smaller neutral particles