Discover the history, structure, and importance of the periodic table of elements, from Mendeleev’s discovery to modern scientific applications. When you purchase through links on our site, we ...

Today, the periodic table is organized by atomic number, which is the number of protons in the nucleus. But they didn’t know about protons then, so they organized everything by atomic weight.

150 years ago, Russian chemist Dmitrii Mendeleev created the periodic table of the elements, revolutionizing chemistry. Skip to content. Subscribe or renew today ...

The periodic table of elements, devised by Russian chemist Dmitri Mendeleev, is a two-dimensional array of the chemical elements, ordered by atomic number and arranged 18 across by orbitals.

Chemistry 402: Organization of the Periodic Table . Season 1 Episode 402 | 27m 33s. Periods and families in the periodic table are described. Aired 01/04/2002 | Rating NR ...

In December 2015, IUPAC made the first of several broadcasts: Four elements, Nos. 113, 115, 117 and 118, met the criteria for inclusion in the periodic table.

On the periodic table, most elements have at least one stable form. But others have only unstable forms, all of which decay by emitting radiation and transforming into different elements until ...

The origins of the periodic table, however, go back to the 1860s. Russian chemist Dmitri Mendeleev, building on the work of others, took the 63 known elements — including hydrogen, ...