Science timeline
Category: Other
Updated: 28 Nov 2018
Science assessment
Contributors
Created byKushaj DWIVEDI [08N02M]
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Events
Democritus (400 BCE)
atomic theory posited that all matter is made up small indestructible units he called atoms.Issac Newton(1704)
theorized a mechanical universe with small, solid masses in motionJohn Dalton(1803)
proposed that elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together.Michael Faraday(1832)
developed the two laws of electrochemistry.Dmitri Mendeleev(1869)
created the periodic table1896 Henri Becquerel
discovered radiation by studying the effects of x-rays on photographic film.1897 J.J. Thomson determined the charge to mass ratio of electrons.1898 Rutherford discovered alpha, beta, and gamma rays in radiation.1904 Richard Abegg found that inert gases have a “stable electron configuration.”1922 Niels Bohr proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit.1938 Lise Meitner, Hahn, Strassman discovered nuclear fission.1942 Enrico Fermi created the first man-made nuclear reactor.
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