Across
- 2. Ne
- 7. Exit
- 9. Carbon
- 12. A challenge
- 15. 6.02x10 to the 23
- 16. S
- 18. J-Shaped curve
- 20. Au
Down
- 1. Protein
- 3. Big number on the periodic table
- 4. Negative
- 5. O
- 6. Xe
- 8. S-shaped curve
- 10. In
- 11. Block
- 13. Peanutbutter
- 14. Positive
- 17. Water
- 19. Neutral