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John Dalton and his Theory
In 1803 John Dalton developed a simple theory of composition of atoms of different weights. He also discovered that the atoms are spherical. -
X-Rays
J.J. Thompson conducted a ray experiment which let to further examination that lead to the world's first x-ray -
Marie Curie
Marie Curie studied, chemical compounds. This lead to a radiation that did not depend on the compound. -
J.J. Thompson's discovery
He discovered that cathode rays were negatively charged particles. He also described the atom to be in the shape of a ball of positive charge containing lots of Electrons. -
Ernest Rutherford
Ernest Rutherford used gold foil experiment to help determine that nucleus of an atom that was dense and had a positive charge. During this he discovered the proton. -
Henry Moseley
Henry Moseley observed and measured the X-ray spectra of chemical elements, obtained by diffraction in crystals. He discovered a relation between wavelength and atomic number. -
Niels Bohr
Niels Bohr built a Bohr planetary model. He was able to show how electrons travel in a certain orbit. -
Francis Aston
Francis Aston was able to determine that for some of the elements, the atomic mass was not the mass of all the atoms. This discovery was called the isotope. -
Erwin Schrodinger
He developed an atom by mixing equations to make a mathematical model of the behavior of waves. -
James Chadwick
He discovered the neutron. This great discovery led to the discovery of the atomic bomb. -
Murray Gell-Mann
He discovered what makes protons and neutrons
