History of the Periodic Table

Robert Boyle

Sep 18, 1661

The earliest ideas of atoms, molecules, and chemical reactions marking the beginning of the history of modern chemistry

Antoine Lavoisier (1743-1794)

Sep 14, 1743

In the late 1700's, French scientist Antoine Lavoisier started to compile a list of all the elements that we're know at the time. Their was only 33 known elements categories.

Jakob Berzelius

Sep 17, 1828

Developed a table of atomic weights and symbols

John Newlands (1837-1898)

Sep 17, 1864

John Newlands proposed an organizational scheme for the elements. He noticed that the elements were increasing by the atomic mass

Lothar Meyer (1830-1895)

Sep 17, 1869

Demonstrated a connection between atomic mass and elements properties

Dmitri Mendeleev (1834-1907)

Sep 17, 1869

Predicted the existence and properties of undiscovered elements

William Ramsay

Sep 17, 1894

Discovered the Noble Gases

Henry Moseley (1887-1915)

Sep 17, 1913

Discovered that atoms contain a unique number of protons called atomic numbers