The classic Mendeleev periodic table sorts elements by number of electrons and then in groups that indicate how readily their atoms bond with others. That bondability factor is based on shell ...

In the periodic table, the number of an element refers to the number of protons in the nucleus of an individual atom. Leading the list is hydrogen (H) with one.

The four elements, known now by their numbers, completed the seventh row of the periodic table when the chemistry organization verified their discoveries last December.

The International Union of Pure and Applied Chemistry (IUPAC) has announced that four new elements — with atomic numbers of 113, 115, 117, and 118 — will be added to the periodic table.

The periodic table of the elements, principally created by the Russian chemist, Dmitry Mendeleev (1834-1907), celebrated its 150th anniversary last year. It would be hard to overstate its importance ...

First published in 1928, Janet’s table correctly positioned the actinide elements (from 89, actinium, to 102, nobelium), many years before most of them were even discovered or created in the lab.

Today, the periodic table has 116 elements, the most recent of which was added just last month -- an element that for now is known as element 118 for the number of protons in its nucleus, more ...

Time to re-write the textbooks. The International Union of Pure and Applied Chemistry (IUPAC) has confirmed the existence of four new elements with the atomic numbers 113, 115, 117, and 118.