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492 BCE
Democritus
Democritus was a very influential ancient greek philosopher primarily remembered today for his formulation of the atomic theory of the universe. -
Dalton's atomic theory and Atomic model
Dalton discovered that elements are made of extremely small particles called atoms. -
Niepce's invention of Photography
With such interest in Lithography, Nipece started working on how to make pictures. -
Death of Napoleon
Died of stomach cancer. -
Mendeleev's Periodic table
Mendeleev made the periodic table to show the illustrate the periodic trends. -
Thomson's CRT, Discovery of Electrons and Atomic model
He showed that the rays were composed of a previously unknowingly negatively charged particles. -
Rutherford's Gold and Foil experiment and atomic model
In this experiment, Rutherford established the nuclear theory of an atom. He concluded a tiny, dense nucleus was causing the deflection in the experiment. -
Discovery of a Proton
Ernest Rutherford performed many experiments to explore radioactivity. In the experiment, the atom needed a positive center which lead to the discovery of the proton. -
Moseley's Periodic table
Henry Moseley modernized the periodic table. He added on from Mendeleev's table. -
Bohr's Atomic model
In his early atomic structure, in which electrons circulate around the Nucleus in discrete, stable orbits with different energy levels. -
Women gained the right to vote
Limited voting rights were gained by women gained by women in Finland, Iceland, Sweden, and the U.S. -
Electron cloud model introduced
This model is used to describe where electrons are when they go around the nucleus. -
Discovery of a Nuetron
James Chadwick was supposed to watch the evidence of Rutherford's tightly bound "proton-electron pair" or nuetron. -
Atomic bombing of Hiroshima
With the conesnt of the United Kingdom, the U.S. dropped nuclear weapons on Hiroshima and Nagasaki. The two bombings killed at least 129,000 people. -
Assassination of Gandhi
Gandhi was assassinated at the Birla House in New Delhi on January 30, 1948. Gandhi was outside on the steps during a prayer meeting by Nathuram Godose.
