halogen
group 17 element
[C/U] Both
pl: halogens
This term describes a specific chemical personality characterized by extreme reactivity. Halogens are the most aggressive non-metals, constantly seeking to acquire an electron to achieve stability. This creates a sense of chemical volatility and potency in a laboratory setting.
In common parlance, the word is frequently associated with lighting technology. Halogen lamps use a halogen cycle to prevent the filament from evaporating, which allows the bulb to operate at higher temperatures and produce a brighter, whiter light than standard incandescent bulbs.
Countable when referring to a specific chemical element from the group (e.g., fluorine is a halogen). Uncountable when referring to the chemical property or the gas used in lighting.