Atomic Theory - Timeline

Marie & Pierre Curie- Discovered radium and polonium - the rays she theorized came from the elements atomic structure

John Dalton - identified the heredity nature of red-green colorblindness - proposed a theory that all matter is made up of atoms that are invisible and indestructible

James Chadwick- discovered neutrons - neutrons are located in the center of an atom

Ernest Rutherford- Discovered nucleus of the atom - demonstrated that the atom has a tiny and heavy nucleus

J.J. Thomson- identified the heredity nature of red-green colorblindness - proposed a theory that all matter is made up of atoms that are invisible and indestructible

Democritus- developed concept of the ‘atom’ - believed everything in the universe was made up of atoms.

Joseph Louis Proust- discovered the law of constant compensation , the law states that if a compound is broken down the masses will have the same proportions regardless of the original substance

Neils Bohr- proposed a theory for the hydrogen atom based on quantum theory- stated that electrons should move around the nucleus only in prescribed orbits.

Michael Faraday- discovered electromagnetic induction, he believed that the atom had more than just negatively charged they had another electrical component.

Erwin Schrodinger-his wave equation is used to find the allowed energy level of quantum mechanical systems, such as atoms.

Antoine Lavoisier- discovered the role oxygen plays in combustion, the first person to make g ood use of balance

Robert Millikan-discovered the study of elementary electronic charge and the photoelectric effect, the electrons are what helps atoms stick together