neon, argon, nitrogen are all possible answers.
carbon
argon
neon
Helium is a light bulbs filler gas. Due to different speed of sound, inhaling helium would made a duck like sound when speak. However, helium is not the laughing gas (though it give out funny effect). Laughing gas is actually nitrous oxide.
The noble gas used in light bulbs and photographs is argon. Argon is used in light bulbs to prevent filament degradation and in photographs to create a stable environment for preserving prints and negatives.
The most common gas used in house light bulbs is argon, which helps to prevent the filament from oxidizing and prolongs the life of the bulb. Some specialty bulbs may also use other gases like krypton or xenon to enhance brightness or color.
Argon
tungsten (or wolfram(W)) is usually used as the metal in domestic lighbulbs. The element used as the gas in domestic lightbulbs is usually argon (Ar). Hope this helps :)
It is not a gas, but a vacuum. This keeps the element (wire) from burning up. No oxygen means it can stay hot longer.
Argon or dry nitrogen are common fill gasses in high wattage bulbs. But low wattage bulbs are just vacuum with no fill.
Neon, argon,
Usally Agron