The periodic table of chemical elements, often called the periodic table, organizes all discovered chemical elements in rows (called periods) and columns (called groups) according to increasing atomic ...

For example, sulfur is commonly known to have a standard atomic weight of 32.065. However, its actual atomic weight can be anywhere between 32.059 and 32.076, depending on where the element is found.

Why do the atomic weights on the periodic table keep changing? Kit Chapman meets the team behind the decimal places ...

The periodic table is one of the triumphs of science. Even before certain elements had been discovered, this chart could ...

Elements with atomic numbers 113, 115, 117, and 118, have been added to the periodic table, according to the International Union of Pure and Applied Chemistry (IUPAC).

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 ...

In this periodic table of elements quiz, you have 10 minutes to name as many elements as you can, given only their symbol, atomic weight and the broad group they live in.

Discover who created the periodic table of elements and how it works. Learn about Dmitri Mendeleev’s contributions, its structure, and why it’s essential for science.