a corrosive, toxic, greenish-yellow, gaseous chemical element, one of the halogens and the most reactive nonmetallic element, forming fluorides with almost all known elements: symbol, F; at. no. 9
Origin of fluorinefluor + -ine
A pale-yellow, highly corrosive, poisonous, gaseous halogen element, the most electronegative and most reactive of all the elements, existing as a diatomic gas (F2) and used in a wide variety of industrially important compounds. Atomic number 9; atomic weight 18.9984; melting point −219.67°C; boiling point −188.12°C; specific gravity of liquid 1.50 (at boiling point); valence 1. See Periodic Table.
(countable and uncountable, plural fluorines)
- (uncountable) The chemical element (symbol F) with an atomic number of 9.
- (chemistry, countable) A fluorine atom.
- an octahedron of fluorines