Across
- 1. : Horizontal row on the periodic table
- 4. : Vertical column on the periodic table
- 6. : Smallest unit of matter
- 7. : Elements that are shiny and conductive
- 8. : Relating to atoms or atomic number
- 10. : Center of an atom
- 12. : First element on the periodic table
- 13. : Soft, highly reactive metal
- 15. : Type of element like helium
- 16. : Dull and Brittle
- 18. : Highly reactive group 1 metals
- 19. : Element used to fill balloons
- 20. : Positively charged particle
- 21. : Element used in bright signs
Down
- 1. : Chart organizing all elements
- 2. : Opposite of metal on the table
- 3. GASSEs : Very stable elements
- 5. : Outer electrons involved in bonding
- 9. : Element essential for life
- 11. : Negatively charged particle
- 14. : Our science teacher
- 17. : Particle with no charge