Across
- 4. the simplest structural unit of an element or compound
- 7. Composed of different things
- 8. Basic unit of matter
- 9. Mass / Volume of matter. How tightly packed the particles are
Down
- 1. A combination of two or more substances that are not chemically combined
- 2. A substance made up of atoms of two or more different elements joined by chemical bonds
- 3. a mixture formed of the same kind; uniform throughout
- 5. A pure substance made of only one type of atoms
- 6. bond the force that holds two atoms together