An unknown element is a solid at room temperature, is highly conductive, and is easily hammered into thin sheets. it is most likely a:

a. metal
b. non-metal
c. metalloid

A. Metal

Metals are very conductive, malleable, and almost all of them are solid at room temperature.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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