-
Newton dealt with the law of mechanics and stated that everything moves no matter the size. He could also prove this mathematically.
-
Dalton stated that different elements could be differentiated by their weight.
-
G.J. Stoney stated that some electrons conduct electricity.
-
J.J. Thomson cathode rays could be deflected by an electric field because they have a small amount of negatively charged electrons.
-
Planck discovered the quantum theory and realised that all particles that have energy have heat.
-
Democritus thought the universe consisted of empty space which meant it had unlimited number of particles which were all different from each other and therefore he called them atoms.
-
-
Developed the structure of an atom.
-
Conducted an oil drop experiment, to measure electric charge. By 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.
-
He named the nucleus and proton. Also explained radioactivity as the disintegration of atoms.
-
Studied the frequencies of x-rays given when electrons strike the positive side of a battery. Realised that the atomic number was equal to the positive charge of an atom.
-
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.
-
Proved the existence of neutrons. Also worked on the creation of the atomic bomb.