the.com/halide

means A halide is a compound formed when a halogen element (fluorine, chlorine, bromine, iodine, or astatine) bonds with another element or group, usually by grabbing an electron to become a negatively charged ion.

from Built from 'halogen' plus the chemical suffix '-ide,' which marks a binary compound or simple ion (as in oxide, chloride, sulfide). 'Halogen' itself comes from Greek hals, 'salt,' plus -gen, 'producer' — so a halogen is literally a 'salt-producer,' coined because these elements so readily combine with metals to form salts like table salt, sodium chloride. A halide, then, is simply the salt-forming half of that reaction, named by chemists in the 19th century as they worked out the family resemblance among fluorine, chlorine, bromine, and iodine.