Democritus

democritus' atomic model

• Democritus thought that the atom was just one little sphere
• he thought that in between atoms, there was empty space
• he thought that the atoms size, and shape was determined, by
• the materials characteristics. He thought water atoms were  
• smooth and slippery, and salt atoms were sharp and pointed because  of thei

Democritus' contributions

• He was a philosipher, not scienctist
• he said atoms are impossible to divide, and impossible to destroy
• He also said everything is made up of atoms

John Dalton

John dalton atomic model

• John Dalton had the idea of a "Billiard ball" atom
•  he said atoms can't be destroyed, divided, or created 

John daltons' contributions

• was an English chemist, physicist and meteorologist 
• known for his work in the "modern atomic theory"
• was a scientist, not a philosopher 

NieLS BOHR

• was a danish physicist and 
• won the nobel prize in 1922
• dissolved nobel piece prize to avoid being
• caught by germans during hitlers reign

niels bohr contributions

• the "molecular double-slit experiment
• light is passed through a barrier with two slits.
• dark stripes and light is produced from the experiment.

Niels bohr atomic model

• Niels Bohr came up with the "Planetary Model" for an atom

J.J. thomson

j.j. thomson contributions

• his experiment was the "Cathode Tube"
• took a tube with gas in it, and sent an electrical
• charge through it and the gas lit up and bent 
• towards the electric source.

J.J. thomson atomic model

• he discovered the electron

erwin schrODINGER

• He was an Austrian Physicist 
• won the nobel prize
• he had tuberculosis 

erwin schrodinger contributions

• studied quantum mechanics
• created wave mechanics

erwin schrodinger atomic model

james chadwICK

james chadwick contributions

• discovered the neutron

james chadwick atomic model

ernest rutherford

ernest rutherford contributions

• worked with J.J. Thomson
• shot light at golden foil and, if light hit a 
• atom, it deflected in a random direction.
• if it didn't, the light just went straight ahead

ernest rutherford atomic model

• discovered the proton