Question

Why is the tungsten used almost exclusively for filament of electric bulb.

Answer 1

Tungsten has the highest melting point $\left(3695K\right)$ , lowest vapour pressure and greatest tensile strength among all the metals. It can reach higher temperatures before melting and hence can emit brighter light. Also , the light emitted due to heated tungsten lies in the visible spectrum and is yellow in colour which makes it the most preferred material for filament of electric bulbs.