Across
- 2. number of protons in the nucleus of an atom
- 8. when two atoms have same number of protons but different numbers of neutrons
- 10. located outside of the nucleus
- 11. A column on the periodic table
- 13. made by physically combining materials
- 16. the elements or compounds at the beginning of a reaction
- 18. a type of mixture that is uniform throughout
- 20. basic unit of matter when all atoms have the same number of protons
- 21. when protons and electrons are unequal
Down
- 1. all matter can be classified as a mixture or a...
- 2. subatomic particle that has no charge
- 3. the elements or compounds at the end of a reaction
- 4. A type of mixture that is not uniform throughout
- 5. An organizational chart of the elements
- 6. Two or more elements chemically combined
- 7. a row on the periodic table
- 9. an atoms ability to attract electrons in a chemical bond
- 12. positively charged particle inside the nucleus
- 13. anything that takes up space and has mass
- 14. ray a nuclear particle with no mass or charge
- 15. smallest unit of matter
- 17. the amount of mass in a a certain amount of space
- 19. the number of protons plus neutrons