Is copper ductile or brittle?
Copper is both malleable and ductile.
Ductility is the ability to be drawn out into a wire. Malleability is the ability to be hammered out into a sheet. Copper is not a particularly hard metal, and it keeps a very poor edge, but it can be alloyed with tin to form bronze, which has excellent tool making properties.
The electrical conductivity of copper (along with its cheapness) is prized.