Usually tungsten.
Tungsten
mercury
tungsten
argon (Ar)
silver
Florine
Argon(or nitrogen) and tungsten are used in incandescent light bulbs.
Tungsten
Tungsten is an element. It is used in bulbs
Tungsten
Tungsten
Nitrogen
carbon
Usually tungsten.
mercury
its used for light bulbs, radio tubes, and welding.
usually tungsten