The Periodic Table, first compiled by Russian chemist ... and is located at the top of the table, while lead (Pb) has 82 protons, and is located much lower in the table.

Copper has been used by humans for as much as 7000 years and elements such as gold, silver, tin, lead and mercury have ... line in the diagram of the periodic table above separates the metals ...

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 ...