[[1]] is the element which is used as the filament of a bulb.

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Detailed Solution

Tungsten is the element which is used as the filament of a bulb.
“Filament is the part of the bulb which attains high temperature; as a result, it starts glowing, the element which is to be used as the filament of the bulb should have a high melting point.” The filament of the bulb is made up of tungsten as the melting point of tungsten is very high, and hence it can glow without melting.

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