History of the periodic table

1862

Sep 14, 1862

French scientist Alexandre Emile Beguyer de Chancourtis listed the elements on paper tape and wound them, spiral like, around a cylinder.

1864

Sep 14, 1864

English scientist John Newlands noticed that if the elements were arranged in order of atomic weight, there was a periodic table similar with 8'elements

1869

Sep 14, 1869

Lothar Myer complied a periodic table of 56 elements based on regular repeating pattern of physical properties such as molar volume. Again, the elements were arranged in order of increasing atomic weights.

1869 continued

Sep 17, 1869

Russian chemist Dmitri Mendeleev produced a periodic table based on weights but arranged "periodically".

1894

Sep 17, 1894

William Ramsay discovered the mobile gas and realized that they made a new group on the periodic table

1914

Sep 17, 1914

Henry Mosley determined the atomic number of each known elements. He realized that if the elements were arranged in order of increasing atomic number rather than weight, they would fit better in the periodic table.

1940

Sep 17, 2015

Glenn Seaborg artificially produced heavy mass elements such as Neptune, these new elements were part of a new block called actinides

1800's

Sep 17, 2015

The discovery of elements over and above the nine known to the ancients and the four studied by medieval alchemists has been previously discussed. The gaseous elements, nitrogen, hydrogen, oxygen, and chlorine, had all been discovered in the eighteenth century. So had the metals, cobalt, platinum, nickel, manganese, tungsten, molybdenum, uranium, titanium, and chromium.