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Particle Adventure- History
Greece. BC
Thought that the universe consisted of empty space and an almost infinite number of particles which differ from each other in their position, form and arrangement. He called them atoms. -
Particle Adventure- History
English
He experimented on the law of mechanics and stated that everything moves, big or small. He also showed this mathematically. -
Wikipedia- John Dalton
English
Said that the atoms of different elements could be distinguished by their weight. -
Wikipedia- George Johnstone Stoney
Irish.
Proposed that there are electrons and they conduct electricity -
Nobel Prizes- Thomson
British.
He found that cathode rays could be deflected by an electric field. They have a small amount of negatively charged particles,. -
Wikipedia- Max PlanckGerman.
Discovered the quantum theory also did a lot of research on heat and realised that all particles that have energy have heat. -
Wikipedia- Hantaro Nagaoka
Japanese.
Developed the structure of an atom, but was not accepted as the universal model -
Wikipedia- Robert Andrews MilikanJulian Trubin- Milikan
USA
Conducted an oil drop experiment, to measure electric charge. This meant balancing the gravitational force with the electric force of the tiny droplets of oil suspended between two electric rods. After a countless droplets, and a few calculations he calculated the mass of a single electron. -
Answers. com - Rutherford
New Zealand.
He named the nucleus and proton. Also explained radioactivity as the disintergration of atoms. Made the accepted model of the structure of an atom. -
Chemistry- MoseleyLibrary thinkquest- atomic development
British
Studied the frequencies of x-rays given when electrons strike the positive side of a battery. Found that there was a realtionship between the x-rays and the atomic number of the metal. Realised that the atomic number was equal to the positive charge of an atom. -
Wikipedia- Neils Bohr
Danish
Bohr model of the atom shows that electrons orbit around the nucleus. Discovered that it is the electrons on the outermost shell of an atom that determines the element's characteristics. -
Nobel Prize - Physics
English
Proved the existence of neutrons. Also worked on the creation of the atomic bomb
