PARTS OF THE ATOM electrons protons neutrons.

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Presentation transcript:

PARTS OF THE ATOM electrons protons neutrons

J.J. THOMSON (1856-1940)

J.J. THOMSON (1856-1940) 1897 – discovered electrons: negatively charged subatomic particles experimented using flow of electric current through gases

CATHODE RAY TUBE

CATHODE RAY TUBE More proof: added + and – charged plates: cathode ray is attracted to + plate

CATHODE RAY TUBE

CATHODE RAY TUBE More proof: added + and – charged plates: cathode ray is attracted to + plate used different gases – always saw beam; different intensities used different metals – always saw beam; different intensities

CONCLUSIONS cathode rays - must be negatively-charged particles: ELECTRONS! these particles are part of every atom calculated mass of e- = 1/2000 of the mass of a hydrogen atom

CROOKES TUBE proved that electrons have mass no fluorescent screen in cathode ray tube Crookes tube video