Halogens are fluorine, chlorine, bromine, iodine, astatine and tennessine; the identification is possible by chemical methods.
noble gasses glow different colors
Halogen gas is in a Tungsten-Halogen Light Bulb.
Halogen.
Halogen is a gas, so your question doesn't make much sense. If you're asking about a halogen (light) bulb, then the answer is: mainly halogen.
Argon is a noble gas. It is not a halogen. Fluorine is a example for that.
The purpose of halogen gas in a tungsten-halogen lamp is to increase the lifespan and efficiency of the lamp. The halogen gas helps to recycle evaporated tungsten back onto the filament, preventing blackening of the glass and extending the life of the lamp.
No halogen gas has a mass of under 15 atomic mass units. The closest is fluorine, at 19.0 atomic mass units.
That'd be Halogen.
Iodine is the halogen that sublimes directly from a solid to a gas at standard pressure and temperature.
No, it is a noble gas
noble gasses glow different colors
The halogen gas with a mass less than 15 is fluorine (F). It has an atomic mass of approximately 19.00 u, but if considering only the halogen gases, it is the lightest halogen. Fluorine is a pale yellow gas at room temperature and is highly reactive, particularly with alkali and alkaline earth metals.