History of the Periodic Table

Events

First Scientifically Discovered Element- Phosphorus

1649

The first scientifically discovered element, phosphorus is discovered by Hennig Brand.

Hydrogen Discovered

1766

Henry Cavendish discovers hydrogen whilst experimenting with iron filings and dilute acids

Oxygen Discovered

1774

Joseph Priestley discovers Oxygen

Uranium Discovered

1789

Uranium is discovered by Martin Heinrich Klaproth.

Sodium Discovered

1807

Sir Humphrey Davy discovers Sodium through separating the sodium metal from Sodium Hydroxide.

Atomic theory Developed

1808

John Dalton developed the atomic theory. The atomic theory stated that all elements must have small microscopic particles which develop the structure of the element. He also stated that a pure element will have identical atoms.

Silicone Discovered

1824

Swedish chemist Jons Jacob Berzelius discovers silicone.

Modern Periodic Table Developed

1865

Dmitri Mendeleev, a Russian chemist develops the periodic table, which was organised based on atomic mass.

Atom Vortex Model Developed

1867

Lord Kelvin develops the Atom Vortex Model which suggested that atoms are twisted in knots or vortices within each other.

Noble Gasses are Discovered

1892

Sir William Ramsay discovered a whole new group of elements that could be found on the periodic table; Noble Gasses.

Radioactivity Discovered

1896

Marie and Pierre Curie in conjunction with Antoine Henri Becquerel discover radioactivity after studying how uranium reacts with sunlight.

Electron Discovered & Plum Pudding Model Developed

1897

JJ Thomson discovers the electron whilst conducting an experiment with cathode rays and magnetic fields. He also developed the plum pudding model which determined the structure of the atom.

Isotopes Discovered

1910

Frederick Soddy discovers the isotope through measuring the atomic mass of some radioactive elements.

Electron Nuclear Model Developed

1911

Earnest Rutherford develops the Electron Nuclear Model which states that electron orbit around the nucleus. Niels Bohr then expands this theory in 1913 to suggest that electrons float around the nucleus in shells.

Electron Shell Model Developed

1913

Dutch physicist and chemist Niels Bohr discovers the electron shell model whilst studying X-Rays

Electron Cloud Model Discovered

1926

Austrian chemist and physicist Erwin Schrödinger discovered the electron cloud model.

Large Hadron Collider Built

1998 - 2008

The European Organization for Nuclear Research builds the Large Hadron Collider to conduct research into particle acceleration.