ATOMIC STRUCTURE THEORY

JOHN DALTON and his postulates

• Elements made up of atoms of only that element
• Had no knowledge of protons, neutrons, or electrons
• image link- http://www.biography.com/people/john-dalton-9265201

J.J. THOMSON

• Discovered the electron
• Created model showing electrons surrounding atoms by electrostatic forces
• Image link- http://commons.wikimedia.org/wiki/File:JJ_Thomson.jpg

Earl Rutherford

• gold foil experiment caused discovery of planetary model
• Planetary model- positively charged nucleus with negatively charge electrons orbiting it
• image link- http://upload.wikimedia.org/wikipedia/commons/d/de/Ernest_Rutherford_1908.j...

Niels Bohr

• discovered that electrons travel in seperate orbits
• discovered that the number of electrons in the outer orbit determines the properties of that element
• image http://static.ibnlive.in.com/ibnlive/pix/sitepix/10_2012/neilsbohr-071012.j...

Robert Millikan

• demonstrated the charge of an electron
• proved the charge was the same for all electrons
• image http://www.biography.com/imported/images/Biography/Images/Profiles/M/Robert...

Irène Curie

• Experiments by her and her husband caused the discovery of the nueron
• image link- http://files.myopera.com/binhminhruclua/albums/939609/thumbs/IRENE%20JOLIOT...

The ELECTRON

• discovered by Thomson
• Bohr and Rutherford discovered orbits
• Millikan discovered its charge

Protons and Neutrons

• Rutherford discovered the nucleus was positively charged
• Irene Curie's experiments caused the discovery of the nueron

The end