Elements in groups 6, 7 and 0 are non-metals. Atoms of group 7 elements ... See the study guide on groups in the periodic table for more information.

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 ...

Can France claim the first periodic ... table contained just 28 elements, organised by their valency (how many other atoms they can combine with). These elements were almost entirely main group ...

There are 118 elements in the periodic table, each with a unique symbol and atomic number. Symbol: A one or two-letter abbreviation used to represent the element. Atomic number: The number of ...