Across
- 2. what we drink from cows
- 3. in milk
- 7. what we breath
- 9. more than one element
- 13. a building block of matter
- 16. Tightly packed atom
- 17. bananas
- 18. A simple pure substance
- 20. crystals found in water
- 21. element with one proton
Down
- 1. a negatively charged subatomic particle that can be either bound to an atom or free
- 4. in blood
- 5. salty
- 6. what pennies are made from
- 8. outer shell of an atom
- 10. a positively charged atom
- 11. the weight of a atom
- 12. sub atomic particle with no charge
- 14. what we drink
- 15. what some cars are made from
- 19. what jewelry is made from