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Transcript of The Atom
Niels Bohr was born on October 7th,1885 and died November 18th, 1962 Danish Physicist
Bohr's theory is that the electrons orbit the nucleus in the shells. Electrons can be bumped up to a higher shell if hit by an electron or a photon of light. James Chadwick was born in Chesire, England on October 20th 1891. James Chadwick discovered the existence of neutrons. Elementary particles devoid of any electrical charge.
Chadwick in this way prepared the way toward the fission in uranium 235 and created the atomic bomb. 1766-1844 All matter is composed of atoms.
Atoms cannot be made or destroyed.
All atoms of the same element are identical.
Heisenberg Born December 5, 1901.
Died February 1, 1976 He realized that measuring the elementary particles alters its momentum in a random matter. 1743-1794 Lavoisier John Dalton He was a french Noble prominant in french Biology and Chemistry.
He Stated the first version of law of converstional Mass.
Helped construct the Metric System.
He wrote the first extensive list of elements. Marcel Proust 10 July 1871 – 18 November 1922
A French novelist, critic and essayist best known for his monumental A Serach in Time
Proust was involved in writing and publishing from an early age. In addition to the literary magazines with which he was associated, and in which he published, while at school
Beginning in 1895 Proust spent several years reading Carlyle, Emerson, and John Ruskin. Ernest Rutherford 30 August 1871–19 October 1937 He was awarded the Nobel Prize in Chemistry for these and other studies, in 1908.
During the investigation of radioactivity he coined the terms alpha and beta in 1899 to describe the two distinct types of radiation emitted by thorium and uranium.
Rutherford's research, along with that of his protégé Sir Mark Oliphant, was instrumental in the convening of the Manhattan Project to develop the first nuclear weapons.
Sir Joseph John “J. J.” Thomson 1856-1940
Joseph John Thomson was born in 1856 in Cheetham Hill, Manchester, England.
Thomson used the cathode ray tube in three different experiments.
In his first experiment, Thomson investigated the idea that the negative charge in the cathode-ray tube could be separated by using magnetism.
In 1905 Thomson discovered the natural radioactivity of potassium
In 1906 Thomson demonstrated that hydrogen had only a single electron per atom. Previous theories allowed various numbers of electrons