Across
- 5. contains two or more substances that are not chemically combined
- 6. outer layers of an atom made up of energy levels
- 8. what has a positive charge
- 9. what is two or more atoms bonded together
- 10. substances you end with after the chemical reaction
- 11. the smallest unit of matter
- 12. protons plus neutrons equal
Down
- 1. what has negative charge
- 2. a substance composed of two or more elements
- 3. what has a neutral charge (no charge )
- 4. substance that consist of atoms that have same number of protons
- 7. substances you start with before the chemical reaction