Chem
Category: Andere
Wurde aktualisiert: 27 Okt 2019
Autoren
Created byJohn Sakoutis
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Ereignisse
. John Dalton
+ Discovered "Indivisible" Atoms
+ Claimed all elements had their own atom. J.J Thomson
+ Found that atoms were divisible and contained electrons
- His model had no nucleus. Ernest Rutherford
+ Discovered a positive charge in nucleus
+ Stated most of an atom is empty space
+Electrons orbited. Erwin Schrödinger
+ Claims electrons are waves and make a cloud around the nucleus
+ Found that it is impossible to determine the position of an electron
+ Found "Clouds of probability" where it is more likely to find an electron
+ Most accurate modelPerioden
Cathode rays were discovered by Julius Plücker and Johann Wilhelm Hittorf. By placing a charge across a glass tube with a vacuum
inside and a phosphor coating outside, it was possible to get a bright glow. Electron travels in straight lines and leave shadows.
If the cathode rays hit a paddle with a phosphor coating, it would force the paddle to move signifying that cathode rays are particles
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