Halogen

Podcast 1 · Introduction

Halogen

A documentary-style narration: origin, meaning, and feel.

Part of speech

noun and adjective

Pronunciation

HAL-uh-jen  /ˈhæləd͡ʒ(ə)n/

Definition

As a noun: any of the five elements fluorine, chlorine, bromine, iodine, and astatine, which form group 17 of the periodic table and are characterised by their high reactivity and tendency to form salts. As an adjective: denoting lighting that uses a tungsten filament surrounded by halogen gas, producing a brighter, whiter light than standard incandescent bulbs.

Plain meaning

Halogens are the group of highly reactive non-metal elements — including chlorine and fluorine — that readily combine with metals to form salts. As an adjective, halogen describes the type of bright white bulb found in many spotlights and car headlights.

Register

Technical and scientific in the periodic table context. In everyday usage, halogen most commonly refers to halogen lighting — the bright, white spotlights in kitchens, bathrooms, and cars. Both senses are widely understood.