![]() ![]() Goldstein discovered canal rays, which have a positive charge equal to an electron.ġ896 Henri Becquerel discovered radiation by studying the effects of x-rays on photographic film.ġ897 J.J. Stoney theorized that electricity was comprised of negative particles he called electrons.ġ879 Sir William Crookes’ experiments with cathode-ray tubes led him to confirm the work of earlier scientists by definitively demonstrating that cathode-rays have a negative charge.ġ886 E. Plucker built one of the first cathode-ray tubes.ġ869 Dmitri Mendeleev created the periodic table.ġ873 James Clerk Maxwell proposed the theory of electromagnetism and made the connection between light and electromagnetic waves.ġ874 G.J. Democritus’ atomic theory posited that all matter is made up small indestructible units he called atoms.ġ704 Isaac Newton theorized a mechanical universe with small, solid masses in motion.ġ803 John Dalton proposed that elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together.ġ832 Michael Faraday developed the two laws of electrochemistry.ġ859 J. ![]()
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