History of the atom

Democritus Born in 460 B.C.E. in Abdera, Greece. Died in 370 B.C.E. Adopted his model of the atom in 422 B.C.E.

Name: John Dalton Born: September 6, 1766 Died: July 26, 1844 From: Eaglesfield,England Introduced the atomic theory into chemistry

Antoine Lavoisier Lavoisier was a French nobleman that founded several elements and put the first table of elements together.

Joseph John Thomson Born December 18, 1856, near Manchester, England Died August 30, 1940, In Cambridge, England J.J. Thomson first studied experimental physics and math at Manchester university and then went to Cambridge. He also started the theory of electromagnetism and found the electron using his cathode ray tube. He also predicted of a particle like the proton.

Ernest Rutherford Born: August 30, 1871 Died: October 19, 1937 From:New Zealand, United Kingdom Rutherford discovered nucleus (dense + charge) and atoms are mostly empty space.

Marie Curie Born in Warsaw, Poland on November 7th, 1867. Died in Sallanches, France on July 4th, 1934. Discovered that radioactivity occured in elements other than uranium.

Max Planck Born April 23, 1858, in Kiel, Schleswig Died October 4, 1947, in Gottingen, Germany Studied at the University of Munich learning about physics and math. Later he would discover the Quantum Theory which explains a lot of atomic and subatomic processes.

Albert Einstein born at Ulm, in Württemberg, Germany, on March 14, 1879. In 1905, Albert Einstein expanded on Planck's theory of the photoelectric effect by introducing the radical idea that electromagnetic radiation has a dual wave particle.

Robert Mallikan Born: Mar 22, 1868 Died: Dec 19, 1953 From: Morrison, Illinois determined the charge and mass of an electron

Henry Moseley Born in Weymouth, England and November 23, 1887. Died August 10th, 1915 in combat in Gallipoli, Turkey. Discovered that an element was determined by the number of protons.

Niels Bohr Born October 7 1885 in Denmark and died on November 16 1964 Bohr developed the Bohr model of the atom, in which he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level (or orbit) to another.

Louis de Broglie Louis-Victor de Broglie was born at Dieppe on 15th August 1892, the son of Victor, Duc de Broglie and Pauline d'Armaille. He gained his science degree in 1913. In 1927 his theory was congirmed by discovery of electron diffraction by crystals.

Erwin Schrödinger born on 12 August 1887, Vienna, Austria, and died on 4 January 1961, in Vienna, Austria Attended Berlin University, Berlin, Germany, and studied in quantum mechanics. Awarded "for the discovery of new productive forms of atomic theory". With the Niels Bohr theory, in 1926 Erwin Schrödinger formulated a wave equation that accurately calculated the energy levels of electrons in atoms.

Werner Heisenberg was born on 5th December, 1901, at Wurzburg. He was the son of Dr. August Heisenberg and his wife Annie Wecklein. Went to the Maximilian school at Munich until 1920, then went to the University of Munich to study physics. After working with Niels Bohr in 1927, he was appointed professor of Theoretical Physics at the University of Leipzig. In 1953 became President of the Alexander Von Humboldt foundation

James Chadwick James chadwick was a British scientist that was born on October 20 1981 born in Bollington and died on july 24 1974. Discovery of neutron is Chadwick’s greatest work. It not only contributed to the better understanding of nucleus, but also paved the way towards the fission of Uranium 235, which ultimately led to the creation of the atomic bomb.