Compound of an Atom

People to Note

• Eugen Goldstein: Discovered Protons, Positively charged subatomic particles

• JJ Thompson- discovered electrons

  • Experiment: Cathode Ray Tube and the Plum Pudding Model
  • Plum Pudding Model: Uniformly distributed throughout a positively charged material

  

• James Chadwick: Discovered neutron, no charge but with mass nearly equal to that of the proton

• Rutherford: Created the Nuclear theory of the atom by the gold foil experiment

Electrons: 1 unite of negative charge and its mass is 1/1840

Electrically Neutral Particle: Number of Electrons + Equal number of positive charge

Electrical Charge: a fundamental property of protons and electrons

Nuclear Theory Of The Atom

1. Most of the atoms mass and all of its positive charge are contained in small cores called nucleus
2. Most of the volume of the atom is empty space through which the tiny, negatively charged electrons are dispersed.

Properties of a Subatomic Particles

quarks- Smaller subnuclear particles