Most light bulb filaments are made from what metal?

Tungsten is correct. It's used for incandescent light bulb filaments because it has the highest melting point of any metal (about 3,422°C), letting it glow white-hot without melting or vaporizing quickly, and it has low vapor pressure at high temperatures, giving filaments a long usable life. Copper melts far too easily (about 1,085°C) and would vaporize almost instantly at filament temperatures. Bronze (a copper alloy) shares the same low-melting-point problem. Iron has a higher melting point than copper but still far below tungsten's, and it oxidizes/burns readily in air at high temperatures, making it unsuitable for a filament that must glow for thousands of hours.

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