Werner Heisenberg

Born: December 5, 1901, Würzburg, GermanyDied: February 1, 1976, Munich, GermanyNationality: GermanHeisenberg's name will always be associated with his theory of quantum mechanics, published in 1925, when he was only 23 years old. For this theory and the applications of it which resulted especially in the discovery of allotropic forms of hydrogen, Heisenberg was awarded the Nobel Prize for Physics for 1932.

Erwin Schrödinger

Born: August 12, 1887, Vienna, Austria

Died: January 4, 1961, Vienna, AustriaNationality: Irish, Austrian

Schrödinger combined the equations for the behavior of waves with the de Broglie equation to generate a mathematical model for the distribution of electrons in an atom. The advantage of this model is that it consists of mathematical equations known as *wave functions* that satisfy the requirements placed on the behavior of electrons. The disadvantage is that it is difficult to imagine a physical model of electrons as waves.

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