Periodic table timeline

Aristotle

340

Describes his ideas of five states of matter

democitus

440

Democritus asserted that there was an infinite number of atoms and that they were so small that their size could not be diminished.

Sir Francis Bacon

Mar 3, 1605

Published "The Proficience and Advancement of learning" which contained a description of the scientiic method

Robert Boyle

Apr 4, 1661

Published "The Skeptical Chymist" which is a treatise on the distinction between chemistry and alchemy.

Henry Cavendish

Jun 6, 1766

Discovered Hydrogen

Antoine Lavoisier

May 5, 1778

Wrote first lit of elements which contained 33 elements and seperated them as metals and nonmetals.

Jacob Berzelius

Jul 7, 1828

Developed a table of atomic weights & introduced letters to symbolize elements

John Newlands

Aug 8, 1864

Arranged the known elemnts in order of atomic weights and observed similarities between some elements

Lother Meyer

Sep 9, 1864

Develops the early version of the periodic table with 28 elements organized by valence

Dimitri Mendeleev

Oct 10, 1864

Produced a table based on atomic weights but arranged 'periodically' with elements with similiar properties under each other. His periodic table included the 66 known elements organized by atomic weights

William Ramsay

Nov 11, 1894

Discovered the noble gases

Marie Curie

Dec 12, 1898

Isolated radium and polonium from pitchblende

Ernest Rutherford

Jan 13, 1900

Discovered the source of radioactivity as decaying atoms

Henry Moseley

Feb 14, 1913

determined the atomic number of each of the elements and modified the "Periodic Law"