Across
- 2. The first word in Tony Starks superhero name
- 3. bones and teeth
- 5. most reactive element
- 6. form of matter that has no fixed shape or volume
- 8. a negatively charged particle
- 11. what paper clips are made from
- 13. What pennies are made from
- 15. is the lightest element
- 17. 0 charged particle
- 18. center of an atom
Down
- 1. Salt
- 3. a substance that can be used in chemistry
- 4. The "opposite" of gold
- 7. smallest component of an element
- 9. What you breathe in
- 10. refers to the periodic table
- 12. a thing on the periodic table
- 13. what you breathe out
- 14. positively charged particle
- 16. What the world cup trophy is made of