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Periodic Table Timeline

The Chemistry and Elements Timeline
Famous people and dates of key discoveries and events
Dmitri Mendeleev and the Periodic Table
Properties and atomic weights
Atomic numbers of the elements and the 'Periodic Law'

The Periodic Tableis an arrangement of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns

Periodic Table Timeline

  • Interesting Information via the Periodic Table Timeline - History and Chronology at a glance, for children and kids
  • Chronology of Key Names, Key Dates, Key People and Key Events in the Periodic Table Timeline

440 BC

 

Democritus and Leucippus propose the idea of the atom, an indivisible particle that all matter is made of.

330 BC

 

Aristotle proposes the four element theory: earth, air, fire & water

360 BC

 

Plato coins term ‘elements’ (stoicheia)

1605

 

Sir Francis Bacon published "The Proficience and Advancement of Learning" which contained a description of what would later be known as the scientific method.

1661

 

Robert Boyle published "The Sceptical Chymist" which was a treatise on the distinction between chemistry and alchemy. It also contained some of the earliest ideas of atoms, molecules, and chemical reaction marking the beginning of the history of modern chemistry

1754

 

Joseph Black isolated carbon dioxide, which he called "fixed air".

1778

 

Antoine Lavoisier wrote the first extensive list of elements containing 33 elements & distinguished between metals and non-metals

1766

 

Henry Cavendish discovered hydrogen as a colorless, odourless gas that burns and can form an explosive mixture with air

1773–1774

 

Carl Wilhelm Scheele and Joseph Priestly independently isolated oxygen

1803

 

John Dalton proposed "Dalton's Law" describing the relationship between the components in a mixture of gases.

1828

 

Jakob Berzelius developed a table of atomic weights & introduced letters to symbolize elements

1828

 

Johann Dobereiner developed groups of 3 elements with similar properties

1864

 

John Newlands arranged the known elements in order of atomic weights & observed similarities between some elements

1864

 

Lothar Meyer develops an early version of the periodic table, with 28 elements organized by valence

1864

 

Dmitri Mendeleev produced a table based on atomic weights but arranged 'periodically' with elements with similar properties under each other. His Periodic Table included the 66 known elements organized by atomic weights.

1894

 

William Ramsay discovered the Noble Gases.

1898

 

Marie and Pierre Curie isolated radium and polonium from pitchblende.

1900

 

Ernest Rutherford discovered the source of radioactivity as decaying atoms

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.

1940

 

Glenn Seaborg synthesised transuranic elements (the elements after uranium in the periodic table)

Periodic Table Timeline

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