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440 BC Democritus and Leucippus propose the idea of the atom, an indivisible particle that all matter is made of
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Periodic Table Timeline 440 BC Democritus and Leucippus propose
the idea of the atom, an indivisible particle that all matter is
made of 360 BC Plato coins the term elements Aristotle proposes the
four element theory: earth, air, fire and water
330 BC Aristotle proposes the four element theory: earth, air, fire
and water 1605 Sir Francis Bacon published The Proficience and
Advancement of Learning which contained a description of what would
be known as the Scientific Method 1649 Hennig Brand becomes the
first known discoverer of an element, phosphorus, from distilled
human urine. 1661 Robert Boyle distinguishes between chemistry and
alchemy. 1661 He also discusses some of the earliest ideas of
atoms, molecules, and chemical reactions marking the beginning of
the history of modern chemistry. 1766 Henry Cavendish discovered
hydrogen. Carl Wilhelm Scheele and Joseph Priestly independently
isolated oxygen. 1778 Antoine Lavoisier wrote the first extensive
list of elements containing 33 elements and distinguished between
metals and nonmetals. 1778 (Some of his elements were later
determined to be compounds and included both heat and light.) John
Dalton proposes the four principles of the modern atomic
theory.
1803 John Dalton proposes the four principles of the modern atomic
theory. 1826 Jakob Berzelius developed a table of atomic weights
and introduced letters to symbolize elements. 1829 Johann
Dobereiner developed groups of three elements with similar
properties (called triads.) 1864 John Newlands arranged the
elements in order of atomic weights and observed similarities
between some elements. 1864 He developed the Law of Octaves. 1864
Lothar Meyer develops an early version of the periodic table with
28 elements organized by valence. 1869 Dmitri Mendeleev produced a
table based on atomic weights but arranged periodically with
elements of similar properties under each other. 1869 His periodic
table included the 66 known elements. 1894 William Ramsay
discovered the noble gases. Marie and Pierre Curie isolated radium
and polonium from pitchblende.
1898 Marie and Pierre Curie isolated radium and polonium from
pitchblende. 1913 Henry Moseley determined the atomic number of
each of the elements and modified the Periodic Law. 1940 Edwin
McMillan and Philip H. Abelson identify neptunium, the lightest and
first synthesized transuranium element, found in the products of
uranium fission. 1941 Glenn Seaborg synthesized and investigated 10
transuranium elements (the elements after uranium on the periodic
table.)
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