What is formed when two or more substances are so evenly combined that you can't see the different parts?

A homogeneous mixture, also sometimes solution. An example would be the mixing of salt and water is a homogeneous solution.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.