Across
- 4. an arrangement of elements into rows and columbs
- 6. the space occupied by a sample of matter
- 9. a starting substance in a chemical reaction
- 10. A substance that can not be changed into something simpler
- 12. a negatively charged subatomic particle
- 13. negative and a negative or positive and a positive charge
- 15. A mixture that is completely uniform in its composition
- 16. a homogeneous mixture
- 18. the smallest particle of an element
- 19. The ratio of the mass of an object to it volume
- 20. figures all the digits that can be known precisely in a measurement
Down
- 1. a mixture that is not uniform in composition
- 2. a chemical equation in which mass is converted
- 3. matter that has a definite shape and volume
- 5. positive and negative charges
- 7. anything that takes up space and has mass
- 8. A reaction that has to do with fire
- 11. a pair of valence electrons that is not involved in bonding
- 14. atoms of the same element that have the same atomic number
- 17. the amount of matter in an object