Atomic History Timeline
Category: Other
Updated: 26 Oct 2017
Contributors
Created byJessie Wallin
Attachments
Events
Democritus
- He discovered the atom
- Was known to be first one to call them atomsAristotle
- Believed that Democritus was wrong
- The world was made up of 4 elementsLavoisier
- Breakthrough with studying chemical reactions
- Created the Law of Conservation of MassDalton
- said matter was made up of atoms
- atoms of certain elements have the same in every wayMy BirthMy Parents' BirthColumbus's VoyageSinking of the TitanicEnd of World War IEnd of the Civil WarEnd of Revolutionary WarEnd of World War IIAvogadro
- simple gases were formed of compound molecules of two or more atoms
- oxygen had split into two atoms in the course of forming water vaporBerzelius
- rejected Dalton's symbols for elements
- found atomic weights of 45 elements in lifetimeThomson
- founded the electron
- thought atoms were made up of positive charges to balance out negative onesM. Curie
- founded radium and polonium
- first woman in France to achieve professorial rankPlanck
- created Planck's radiation law
- formula that related the energy of the radiation to its frequencyMillikan
- determined the unit charge of the electron
- formed a formula that calculates the mass of the electron and the positively charged atomsBohr
- Said electrons in atoms orbit the nucleus
- The laws of classical mechanic applied to the motion of electronsMoseley
- created Moseley's law
- found the three unknown elements between aluminum and goldRutherford
- discovered the proton
- discovered the possible existence of the eutronHeisenberg
- founded the Uncertainty Principle
- electrons surround the outside of an atomic nucleus in the electron cloudSchrodinger
- developed model for electron cloud
- mathematically determined the regions where electrons would most likely be foundChadwick
- first to talk about neutrons
- created the model we use today
Comments