Across
- 2. Subatomic particle with a positive (+) charge!
- 3. The Center of an Atom!
- 5. Most elements on the Periodic Table!
- 7. The number of protons in the nucleus can identify this!
- 8. Smaller than an Atom!
- 9. Subatomic particle with a negative (-) charge!
- 10. Subatomic particle with no charge!
- 11. A chart that organizes the elements!
- 14. The number of protons + the number of Neutrons can identify this!
- 15. All living things are made of it!
Down
- 1. Elements that make up Group #18!
- 4. The electrons in the outermost energy level are called _________!
- 6. Atoms of the same type that have different numbers of neutrons!
- 12. A substance that can't be broken down chemically into any other substance!
- 13. Building blocks of life!