There are a total of 116 Chemical Elements compiled in this index. The selection includes elements verified and named by IUPAC through atomic number 116 (livermorium), with data drawn from IUPAC, NIST, and PubChem.

Chemical Elements are pure substances made of atoms that share the same number of protons. Each element has a unique atomic number, characteristic properties, and a chemical symbol. They range from simple gases to dense metals and radioactive transuranics. Elements form the basis of matter and enable applications from medicine and energy to materials and electronics.

Interesting and little-known facts about Chemical Elements:
– About 90 elements occur naturally; the remainder are synthetic and made in laboratories or reactors.
– Hydrogen makes roughly 75% of the universe’s baryonic mass; helium supplies about 24%.
– There are 11 elements that are gases at standard conditions, including hydrogen, nitrogen, oxygen and the noble gases.
– Tungsten has the highest melting point of the elements at 3,422 °C, which makes it vital for high-temperature applications.
– Fluorine is the most electronegative element, driving exceptionally reactive chemistry in many compounds.

The alphabetical index links to A–Z entries for each letter.
Columns list: name, symbol, atomic number (integer), standard atomic weight (three decimals), discovery year or “Antiquity”, and a source citation.