Question

a ____________ is a pure substance made up of two or more different kinds of _______.
a. element, chemicals
b. constant, physicals
c. pure, pure
d. compound, atoms

Explanation:

A compound is a pure - substance formed by two or more different kinds of atoms chemically combined. Elements are made of only one kind of atom. Options A, B, and C do not match the correct definitions in chemistry.

Answer:

D. compound, atoms