Atomic Structure

J

J.J. Thomson discovered electrons through cathode ray tube experiments in 1897. When high voltage was applied across electrodes in an evacuated tube,

Eugen Goldstein discovered protons in 1886

Eugen Goldstein discovered protons in 1886 using a perforated cathode in a discharge tube. Canal rays or anode rays were observed flowing opposite to

Thomson proposed that an atom consists

Thomson proposed that an atom consists of a large sphere of uniform positive charge with negatively charged electrons scattered throughout it, like pl

Geiger and Marsden

Geiger and Marsden, under Rutherford's guidance, directed alpha particles at a thin gold foil. Most particles passed straight through, some were defle

Bohr proposed that electrons move

Bohr proposed that electrons move in definite circular orbits of fixed energy around the nucleus, called stationary states. Electrons don't radiate en