Some Elements of the Earth and their uses
BROMINE
- photographic film, gasoline anti-knock, flameproofing agents, dyes
IODINE
- disinfectant, photographic material, radio active tracer
HELIUM
- balloons, blimps, lasers, hydrogen bomb, nuclear plant coolant
NEON
- neon lights, lightning arrestors, TV tubes, cryogenic refrigerant