History of the Periodic Table

Johann Wolfgang Dobereiner

Mar 24, 1849

🇩🇪 A German scientist. 13 December 1780 – 24 March 1849
He found groups of three elements which were later called Dobereiner's triads.

John Alexander Reina Newlands

Jul 29, 1898

🇬🇧 A British scientist. 26 November 1837 – 29 July 1898
Arranged elements in increasing atomic mass.
He created Newland's Law of Octaves.

Dmitri Ivanovich Mendeleev

Feb 2, 1907

🇷🇺 A Russian scientist. 8 February 1834 – 2 February 1907
He arranged elements by atomic mass and by seeing how reactive they were. He is known as the "Father" of the Modern Periodic Table.

Henry Mosely

Aug 10, 1915

🏴󠁧󠁢󠁥󠁮󠁧󠁿 An English scientist. 23 November 1887 – 10 August 1915
He arranged elements by atomic number.