Asubstance that is made of atoms of more than one type bound together is called a(n) .
a. mixture
c. emulsion
b. compound
d. isotope select the best answer from the choices provided a b c d

The answer is compound (b).

A mixture is two substances mixed physically, but not chemically, so it cannot be A, because two atoms combining is automatically a chemical change. An emulsion is a dispersion of water droplets, so it has absolutely nothing to do with atoms combining. An isotope is an atom of an element with a different number of neutrons, which does not deal with two atoms being bound together.

A compound, however, matches the definition perfectly!

Hope this helps!