Final answer:
The subject of this question is Chemistry. Tungsten, with the highest melting point among pure elements, is used as the filament in light bulbs.
Step-by-step explanation:
The subject of this question is Chemistry. Tungsten is an element that has the highest melting point among all pure elements. It is used as the filament in ordinary light bulbs, which emit light when the filament is heated. The symbol for tungsten, W, is derived from its German name, wolfram.