Atomic History Timeline
Category: Other
Updated: 24 Apr 2023
Contributors
Created byColin-Jase McCormick
Attachments
Periods
Democritus
Born: 460 BC
Died: 370 BC
Associated theory: Proposed the idea of atoms being the smallest particles of matter.John Dalton
Born: September 6, 1766
Died: July 27, 1844
Associated theory: Developed the atomic theory, which states that all matter is made up of atoms, and that atoms of different elements are different in size and mass.J.J. Thompson
Born: December 18, 1856
Died: August 30, 1940
Associated theory: Discovered the electron and proposed the Plum Pudding Model, which suggested that electrons were scattered throughout a positively charged atom.E. Rutherford
Born: August 30, 1871
Died: October 19, 1937
Associated theory: Discovered the nucleus of an atom and proposed the Nuclear Model, which suggested that the nucleus was positively charged and contained most of the atom's mass.Niels Bohr
Born: October 7, 1885
Died: November 18, 1962
Associated theory: Proposed the Bohr Model, which suggested that electrons orbited the nucleus in discrete energy levels.James Chadwick
Born: October 20, 1891
Died: July 24, 1974
Associated theory: Discovered the neutron, which helped explain why some elements had different isotopes.Werner Heisenberg
Born: December 5, 1901
Died: February 1, 1976
Associated theory: Proposed the Uncertainty Principle, which suggested that the position and momentum of a particle cannot both be precisely measured at the same time.Dmitri Mendeleev
Born: February 8, 1834
Died: February 2, 1907
Associated theory: Developed the Periodic Table of Elements, which organized elements based on their atomic number and chemical properties.E. Schrodinger
Born: August 12, 1887
Died: January 4, 1961
Associated theory: Developed the Schrodinger Equation, which describes the behavior of electrons in an atom and is used to calculate the probability of finding an electron in a particular location.
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