Development of the Periodic Table

Events

The first scientific discovery of an element - Hennig Brand

1649

The element was phosphorous

Johann Dovereiner noticed the atomic weight of strontium decreased

1817

A series of scientists found types of chemical relationships extended over the laws of triad

1829 - 1858

John Newlands wrote a paper which classified the 56 established elements into 11 goups

1862

The first periodic table was ordered

1862

Properties of 63 elements had been discovered

1869

Erest Rutherford wrote down studies of the atomic structure

1911

The last major changes to the periodic table were discovered by Glenn Seaborg

1940