Across
- 3. Equal sharing of electrons
- 7. A substance undergoes a chemical reaction
- 12. Where all elements are found
- 17. In an Atom & has a neutral charge
- 18. Formed from a single atom
- 19. Substance combines with another to form a new substance
- 21. Atom loses valance electron and gains them from another
Down
- 1. Releases energy
- 2. Absorbs Heat
- 4. Measurement of how tightly packed together something is
- 5. One element replaces a similar element in a compound
- 6. Atoms of the same element with different #'s of neutrons
- 8. A mathematical sentence
- 9. A subatomic particle with a positive charge
- 10. The substances that go into a chemical reaction
- 11. Negatively charged Particle
- 13. The appearance changes but matter in substance doesn't
- 14. Gold,Copper,Tin
- 15. Process of rotting
- 16. Hydrogen,Oxygen,Carbon
- 20. Formed by chemical reactions