Development of Periodic Table Timeline

1. Group 4

3. 1668—
 Periodic table was first published by Dmitri Mendeleev in 1869.
The elements carbon, sulfur, iron, tin, lead, copper, mercury, silver, and gold
are known to humans since ancient times.
1669—
 Phosphorus was discovered by German alchemist Hennig Brand.
1735—
 Cobalt was first discovered by a Swedish chemist Georg Brandt.
1748—
 Platinum was described by Julius Caesar Scaliger in 1557. But the metal
was observed by Antonio de Ulloa and Don Jorge Juan y Santacilia in 1748.
1751—
 Nickel was discovered by the Swedish chemist Axel Fredrik Cronstedt.
1766—
 Hydrogen was discovered by English chemist and physicist Henry
Cavendish.

4. 1772—
 Nitrogen was discovered by Scottish chemist Daniel Rutherford.
1774—
 Chlorine was discovered by a Swedish scientist, Carl William Scheele.
1774—
 Manganese was first observed by Swedish chemist Johann Gottlieb Gahn.
1774—
 Oxygen was discovered by English chemist Joseph Priestley and Swedish
chemist Carl Wilhelm Scheele.
1781—
 Swedish chemist Peter Jacob Hjelm isolated molybdenum in 1781. However
molybdenum was discovered by Carl Welhelm Scheele, a Swedish chemist,
in 1778.
1782—
 Tellurium was discovered by Austrian mineralogist Franz-Joseph Müller von
Reichenstein.

5. 1783—
 In 1781, Carl Wilhelm Scheele discovered that a new acid, tungstic
acid, could be made from scheelite. Tungsten was isolated by on
Juan José D'Elhuyard and Don Fausto D'Elhuyard, Spanish
chemists and brothers, in 1783, and they are credited with the
discovery of the element.
1789—
 Uranium was discovered by German chemist Martin Heinrich
Klaproth.
1789—
 Zirconium was discovered by German chemist Martin Heinrich
Klaproth.
1791—
 Titanium was first discovered by English clergyman William Gregor.
1794—
 Yttrium was discovered by Finnish chemist Johan Gadolin.
1797—
 Chromium was discovered by French chemist Louis-Nicolas
Vauquelin.

6. 1798—
 Beryllium was discovered by French chemist Louis-Nicolas
Vauquelin.
1801—
 Niobium was discovered by the English chemist Charles Hatchett.
1801—
 Vanadium was discovered by Mexican chemist Andrés Manuel del
Río discovers vanadium.
1802—
 Tantalum was discovered by Swedish chemist and mineralogist
Anders Gustaf Ekeberg.
1803—
 Palladium was discovered by English chemist and physicist William
Hyde Wollaston.
1803—
 Rhodium was discovered by English chemist and physicist William
Hyde Wollaston.

7. 1803—
 Iridium was discovered by English chemist Smithson Tennant.
1803—
 Cerium was discovered in Sweden by Jön Jakob Berzelius
and Wilhelm Hisinger, and independently in Germany by
Martin Heinrich Klaproth, both in 1803.
1804—
 Osmium was discovered by English chemist Smithson
Tennant.
1807—
 Potassium was discovered by English chemist Sir Humphry
Davy.
1807—
 Sodium was discovered by English chemist Sir Humphry Davy.
1808—
 Barium was isolated by English chemist Sir Humphry Davy.

8. 1808—
 Strontium was isolated by English chemist Sir Humphry Davy.
1808—
 Calcium was discovered by English chemist Sir Humphry Davy.
1808—
 Magnesium was discovered by Joseph Black, in England, in 1755.
The element was isolated by A. A. B. Bussy and Sir Humphrey Davy
in 1808.
1808—
 Boron was first discovered by Sir Humphrey Davy, Joseph-Louis
Gay-Lussac and Louis Jacques Thênard.
1811—
 Iodine was discovered by the French chemist Bernard Courtois.
1817—
 Lithium was discovered by Swedish chemist Johan August
Arfwedson.

9. 1817—
 Cadmium was discovered by German chemist Friedrich Stromeyer.
1817—
 Selenium was discovered by Swedish chemists Jöns Jacob
Berzelius and Johan Gottlieb Gahn.
1824—
 Silicon was first identified by the French chemist Antoine Lavoisier in
1787. Silicon was re-discovered by Jöns Jacob Berzelius, a Swedish
chemist, in 1824.
1825—
 Aluminium was discovered by Danish chemist and physicist Hans
Christian Oersted.
1826—
 Bromine was discovered by two chemists, C. Lowg in Germany and
Antoine-Jérôme Balard in France in 1825 and 1826, respectively.
1828—
 Thorium was discovered by Swedish chemist Jöns Jakob Berzelius.

10. 1839—
 Lanthanum was discovered by a Swedish chemist, Carl Gustaf
Mosander.
1843—
 Terbium was discovered by a Swedish chemist, Carl Gustaf
Mosander.
1843—
 Erbium was discovered by the Swedish chemist, Carl Gustaf
Mosander.
1844—
 Ruthenium was discovered by the Russian scientist Karl Ernst Claus.
1860—
 Caesium was discovered by German chemists, Robert Wilhelm
Bunsen and Gustav Robert Kirchhoff.
1861—
 Rubidium was discovered by German chemists Robert Bunsen and
Gustav Kirchhoff.

11. 1861—
 Thallium was discovered by British physicist Sir William Crookes.
1863—
 Indium was discovered by German chemists Ferdinand Reich and
Hieronymus Theodor Richter.
1875—
 Gallium was discovered by the Paul-Émile Lecoq de Boisbaudran.
1878—
 Ytterbium was discovered by the Swiss chemist Jean-Charles-
Galissard de Marignac.
1878—
 Holmium was discovered by Marc Delafontaine and Jacques-Louis
Soret in 1878 in Switzerland. Later in 1878, a Swedish chemist, Per
Teodor Cleve independently discovered the element holmium.

12. 1879—
 Thulium was discovered by Swedish chemist Per Theodor Cleve.
1879—
 Scandium was discovered by Swedish chemist Lars Fredrik Nilson.
1879—
 Samarium was discovered by French chemist, Jean Charles
Galissard de Marignac in Switzerland in 1853. It was isolated in
France in 1879 by the French chemist Paul-Émile Lecoq de
Boisbaudran.
1880—
 Gadolinium was only discovered by a Swiss chemist called Jean
Charles Galissard de Marignac.
1885—
 Praseodymium was discovered by Carl F. Auer von Welsbach, a
German chemist.
1885—
 Neodymium was discovered by Baron Carl Auer von Welsbach in
Vienna, Austria.

13. 1886—
 Germanium was discovered by German chemist Clemens Alexander
Winkler.
1886—
 Fluorine was discovered by French chemist Henri Moissan.
1886—
 Dysprosium was discovered by French chemist Paul-Émile Lecoq de
Boisbaudran.
1894—
 Argon was discovered by English chemists Lord Rayleigh and William
Ramsav.
1895—
 French astronomer Pierre Janssen in 1868 found proof that a new element
helium existed in the Sun. Helium was isolated by Sir William Ramsay and
independently by N. A. Langley and P. T. Cleve at 1895 in London, England
and Uppsala, Sweden.
1898—
 Krypton was discovered by Sir William Ramsay, a Scottish chemist, and
Morris M. Travers, an English chemist.

14. 1898—
 Neon was discovered by Sir William Ramsay, a Scottish
chemist, and Morris M. Travers, an English chemist.
1898—
 Xenon was discovered by Sir William Ramsay, a Scottish
chemist, and Morris M. Travers, an English chemist.
1898—
 Polonium was discovered by French physicists Marie and
Pierre Curie.
1898—
 Radium was discovered by French physicists Marie and
Pierre Curie.
1899—
 Actinium was discovered by French chemist André-Louis
Debierne.

15. 1900—
 Radon was discovered by German physicist Friedrich Ernst
Dorn.
1901—
 Europium was discovered by French chemist Eugène-Anatole
Demarçay.
1907—
 Lutetium was independently discovered by French scientist
Georges Urbain, Austrian mineralogist Baron Carl Auer von
Welsbach, and American chemist Charles James.
1917—
 Protactinium was discovered in 1917/18 by Otto Hahn and
Lise Meitner.
1923—
 Hafnium was discovered by Dutch physicist Dirk Coster and
Hungarian chemist George Charles de Hevesy.

16. 1925—
 Rhenium was discovered by the German chemists Ida Tacke-
Noddack, Walter Noddack and Otto Carl Berg.
1936—
 Technetium was officially discovered by Italian physicist Emilio
Segré and his colleague Carlo Perrier.
1939—
 Francium was discovered by Marguerite Catherine Perey, a
French chemist.
1940—
 Neptunium was discovered by Edwin M. McMillan and Philip
H. Abelson.
1940—
 Astatine was isolated by Dale R. Corson, Kenneth R.
Mackenzie, and Emilio Segré.

17. 1940—
 Plutonium was discovered by Glenn Seaborg, Edwin McMillan,
Joseph Kennedy, and Arthur Wahl at the University of
California, Berkeley.
1944—
 Americium was discovered by Glenn Seaborg, Leon Morgan,
Ralph James and Albert Ghiorso at the University of California,
Berkeley.
1944—
 Curium was discovered by Glenn T. Seaborg, Ralph A. James,
and Albert Ghiorso at the University of California, Berkeley.
1945—
 Promethium was first produced at Oak Ridge National
Laboratory in 1945 by Jacob A. Marinsky, Lawrence E.
Glendenin and Charles D. Coryell. But its discovery was
announced in 1947.

18. 1949—
 Berkelium was discovered by Glenn T. Seaborg, Albert
Ghiorso, Stanley G. Thompson and Kenneth Street at the
Berkeley Radiation Laboratory.
1950—
 Californium was discovered by Stanley Thompson,
Kenneth Street, Jr., Albert Ghiorso and Glenn T. Seaborg
at the University of California at Berkeley.
1952—
 Einsteinium was discovered by Albert Ghiorso and co-workers
at Berkeley Laboratories, University of California,
USA.
1952—
 Fermium was discovered by Albert Ghiorso and co-workers
at the University of California at Berkeley.

19. Antoine-Laurent de Lavoisier Hennig Brand
Lavoisier's Traite Elementairede
Chimie (Elementary Treatise of
Chemistry) is considered to be
the first modern
textbook about chemistry.
It contained a list of "simple
substances" that Lavoisier
believed could not be broken
down further, which
included oxygen, nitrogen, hydr
ogen, phosphorus, mercury, zin
c and sulfur, which formed the
basis for the modern list of
elements.
first person in
history to
discover a new
element
Dmitri Mendeleev
was the first scientist
to make a periodic
table similar to the
one used today.
Henry Moseley
He was then able to re-sequence
the periodic table
by nuclear charge, rather
than by atomic
weight. Moseley's discovery
showed that atomic numbers
were in fact based upon
experimental
measurements.
Johann Wolfgang Döbereiner
formed the triads of elements
with similar properties like the
triad of calcium, barium and
strontium.
1817
John Newlands
an English chemist proposed the Law of
Octaves. He based his classification of
elements on the fact that similar
properties could be noted for every eight
element when they are arranged in order
of increasing atomic masses.
1863
1869
1649
1914
1789