Across
- 2. Located in the nucleus of an atom and has no electrical charge
- 4. Contains two or more different substances, some of which are not chemically combined together
- 5. Cu
- 7. A number used to arrange the Periodic Table
- 9. H
- 10. Contains only one type of atom
Down
- 1. Contains two or more different types of atoms, chemically bonded together.
- 3. Located outside of the nucleus of an atom
- 6. Located in the nucleus of an atom and has a positive charge
- 7. Ar
- 8. He