Atomic Timeline by Natalie Tveit https://padlet.com/tveitnat0001/k745qfvsvwn4 Created by Natalie Tveit, Mckenzie en-us 2018-11-01 15:23:46 UTC 2018-11-05 16:29:29 UTC hello@padlet.com Democritus blechmck0001 https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299817446 Greek philosophers about 2500 years ago. In the 1800's scientists got enough data that they could finally experiment. 
Atoms were discovered in matter. 
All matter has very small particles called atoms that are too small to be divided. 



]]> 2018-11-02 14:51:22 UTC https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299817446 John Dalton blechmck0001 https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299817611 1766
Evidence of atoms, developed first atomic theory of matter.
Theory: Individual atoms cannot be divided 
Experiment and model: Wooden spheres to represent atoms


]]> 2018-11-02 14:51:40 UTC https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299817611 JJ Thompson blechmck0001 https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299817717 1856-1940
model: rubbed amber and it picked up feather
Experiment: Glass tube with disks that are charged and created a beam 
atoms are made of even smaller particles. ]]> 2018-11-02 14:51:52 UTC https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299817717 Earnest Rutherford blechmck0001 https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299817931 1871-1937
Discovered alpha particles. 
Model: proves that all atoms positive charge is in the nucleus.
Experiment: When particles hit gold foil the particles went in different directions.

]]> 2018-11-02 14:52:13 UTC https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299817931 Niels Bohr blechmck0001 https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299818079 1885- 1962
Model: Focused on electrons. ( Diagram of planets around sun are based off of Bohr's model)
Energy levels, the positive energies that electrons in an atom can have. 
Experiment: Electron cloud, most likely locations for electrons in an atom. ]]> 2018-11-02 14:52:26 UTC https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299818079 James Chadwick blechmck0001 https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299818187 1932
Alpha particles have a radiation 
Experiment: Proves mystery radiation of alpha particles were gamma rays.
Model: Nucleus orbits, electrons orbit the nucleus. ]]> 2018-11-02 14:52:39 UTC https://padlet.com/tveitnat0001/k745qfvsvwn4/wish/299818187