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 ...

Copper has been used by humans for as much as 7000 years and elements such as gold, silver ... line in the diagram of the periodic table above separates the metals, on the left, from non-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 ...

But how many of these elements do you know? Test your knowledge and compete with other Live Science readers to see who can ...

On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.