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.

How is the table organized? The Periodic Table, first compiled by Russian chemist Dmitri Mendeleyev, is organized by the number of protons in the nucleus of each element's atom, known as the ...

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 ...

Which are the heaviest metals on earth? And what are their uses? Discover the metal that ranks heaviest based on density and ...