-
460
Developing the idea of the atoms - Democritus
He was the first scientist to question the ideas of atoms. -
Questioning the structure of atoms - John Dalton
He was an English chemist and he questioned about the structure of the atoms again. He knew that there was something about it but he couldn't discover anything. -
The Frist periodic table - Dimitri Mendeleev
He tried to arrange the chemicals by their atomic weight and he then found that there were some unique ones that could not belong to any groups. -
Discovery of polonium and radium compounds - Curies
After isolating various substances by successive chemical reactions and crystalizations of the products, the curies were able to discover polonium and radium. They then tested their ability to ionise the air. -
Discovery of the Photon - Albert Einstein
He discovered that the energy waves behave like discrete particals. He called this photons. -
Quantum theory - Niels Bohr
He developed the theory that certain theories only occure in discrete amounts (Quanta). -
Discovery of Protons - Ernest Rutherford
He identified the the positively charged matter in the nuclues and hence discovered protons. -
Electron Discovered - J.J.Thomson
He discovered the existence of the electrons and introduced a model for the structure of the atom. He also found out that electrons are negatively charged. -
Discovery of the Neutrino - Clyde Cowan and Fred Reines
He discovered a new elementary particle. -
String Theory - Gabriele Veneziano
He called the Strong interaction of particles as 'string theory'.
