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Aristotle
He was born in 384 B.C. He believed that there is no limit to the number of times matter can be divided. Most people agreed with his views on the structure of matter. -
John Dalton
He was born on September 6, 1766. his theory was that matter is made up of individual particles called atoms, which cannot be divided or separated. His main points are all elements are composed of atoms, and compounds contain atoms of more than one element. -
J.J. Thomson
He was born on December 18, 1856. J.J. Thomson discovered the plum pludding model of the atomic model. In his model an atom is made up of electrons surrounded by an area of positive charges to balance out the negative charges. -
Hantaro Nagaoka
He was born on August 15, 1865. He developed a very early planetary model of an atom which was actually incorrect. The model was actually based on the stability of Saturns rings. -
Ernest Marsden
He was born on February 19, 1889. Ernest actually discovered the atomic nucleus. He found this out by doing the gold foil expiriment or is also known as the rutherford expiriment. -
Ernest Rutherford
He was born on August 30, 1871. Ernests theory was that atoms have their positive charge concentrated in a very small nucleus. He did the gold foil expiriment to construct this theory. -
Niels Bohr
He was born on October 7, 1885. He constructed a picture of the atomic structure. He studied the structure of atoms, based on the discovery of Rutherfords find of an atomic nucleus. -
Henry Moseley
He was born on November 23, 1887. he made Henry's law of advanced physics.Henry did this by providing the first experimental evidence of Niels Bohr's theory. -
Louis de Brogile
He was born on August 15, 1892. Louie developed a thesis of important findings. Basis for developing the general theory which is now known as wave mechanics. -
Erwin Schrödinger
He was born on August 12, 1887. He made a mathematical model for the distribution of electrons in an atom. Erwin combined the equations for the behavior of waves with the Louis de Broglie equation. -
James Chadwick
He was born on October 20, 1891. Chadwick proved the existence of neutrons. He discovered this because he heard of a new method of detecting particles emitted by radioactive elements this was developed by Irene Joliot-Curie. -
Democritus
Democritus was born in 460 B.C. His theory was that everything is made of atoms which are indivisible (can not be separated). He thought that different types of atoms with specific sets of properties.
