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6 September 1766 was the birth of John Dalton
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It was in the early 1800s that John Dalton came up with his atomic theory and five points to it: o Elements are made of extremely small particles called atoms.
o Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties.
o Atoms cannot be subdivided, created, or destroyed.
o Atoms of different elements combine in simple whole-number ratios to form chemical compounds.
o In chemical reactions, atoms are combin -
27 July 1844 was the date John Dalton died
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18 December 1856 J.J Thompson was born
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30 August 1871 was the date of birth for Ernest Rutherford
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7 October 1885 Bohr was born
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12 August 1887 was the date of birth of Erwin Schrodinger
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James Chadwick was born on 20 October 1891
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5 December 1901 was the date Heisenberg was born
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In 1905 Thomson discovered the natural radioactivity of potassium
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Thomson was awarded the 1906 Nobel Prize in Physics for the discovery of the electron and for his work on the conduction of electricity in gases.
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In 1906 Thomson demonstrated that hydrogen had only a single electron per atom. Previous theories allowed various numbers of electrons
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He was awarded in 1908 "for his investigations into the disintegration of the elements, and the chemistry of radioactive substances".
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Along with Hans Geiger and Ernest Marsden, Rutherford carried out the Geiger–Marsden experiment, which demonstrated the nuclear nature of atoms
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He theorized that atoms have their positive charge concentrated in a very small nucleus, and thereby pioneered the Rutherford model of the atom, through his discovery and interpretation of Rutherford scattering in his gold foil experiment.
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In 1912 he met and later joined Ernest Rutherford at Manchester University, where on and off he spent four fruitful years in association with the older physics professor.
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Here he introduced the theory of electrons traveling in orbits around the atom's nucleus, the chemical properties of each element being largely determined by the number of electrons in the outer orbits of its atoms.Bohr also introduced the idea that an electron could drop from a higher-energy orbit to a lower one, in the process emitting a photon (light quantum) of discrete energy. This became a basis for quantum theory.
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In 1916, Bohr returned permanently to the University of Copenhagen, where he was appointed to the Chair of Theoretical Physics, a position created especially for him
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He is widely credited with first "splitting the atom" in a nuclear reaction between nitrogen and alpha particles, in which he also discoveredthe proton.
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he succeeded in founding the Institute of Theoretical Physics in
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Bohr made foundational contributions to understanding atomic structure and quantum mechanics, for which he received the Nobel Prize in Physics in 1922.
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Schrödinger published a paper on wave mechanics and what is now known as the Schrödinger equation.
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Werner Heisenberg worked as an assistant to Bohr and university lecturer in Copenhagen from 1926 to 1927
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Born September 15, 1929
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Heisenberg was awarded the 1932 Nobel Prize in Physics for the creation of quantum mechanics, and its application especially to the discovery of the allotropic forms of hydrogen
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Chadwick was awarded for his discovery of the neutron in 1932
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19 October 1937 was the death of Rutherford
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30 August 1940 was the death of J.J Thomson
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Received the first ever Atoms for Peace Award in 1957.
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Death of Erwin Schrodinger on 4 January 1961
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18 November 1962 Niels Bohr passes away.
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He was awarded a Nobel Prize in physics in 1969 for his contributions and discoveries concerning the classification of elementary particles and their interactions.
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James Chadwick died on 24 July 1974
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1 February 1976 was the date of Werner Heisenberg's death
