The Periodic Table

Events

1778 - Antoine Lavoisier

1778

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

1828 - Jöns Jakob Berzelius

1828

Jöns Jakob Berzelius introduced letters to symbolise each element, this then became the new language of chemistry. Berzelius also developed a table of atomic weights.

1864 - Lothar Meyer

1864

Lothar Meyer produced a table of 28 elements listed by their valency, he classified elements into six families according to their valence.

1869 - Dmitri Mendeleev

1869

Dmitri Mendeleev created the periodic table similar to what we use today. His Periodic Table was compiled on the basis of arranging the elements in ascending order of atomic weight and grouping them by similar properties. He predicted the existence and properties of new elements that were yet to be discovered. He is known as the ‘father of the periodic table’.

1894 - William Ramsay

1894

William Ramsay discovered neon, argon, krypton and xenon, which have similar properties to helium and radon. This then formed a whole new group of the periodic table, the noble gases.

1913 - Henry Moseley

1913

Henry Moseley determined the atomic number of each of the elements. He modified the 'Periodic Law' so that the properties of the elements vary periodically with their atomic numbers. He also predicted that there were 3 unknown elements between aluminium and gold.