Across
- 1. large particles that settle out; ex. blood
- 5. energy that does work
- 6. when two or more different kinds of atoms bind
- 8. bonds that share electrons
- 9. electrically negative
- 11. used in Pet scans
- 17. shell another name for energy level
- 20. electrically neutral
- 21. number of of an atom that is sum of protons and neutrons
- 22. reaction that involves atoms combining to form large molecule
- 24. structural variations of elements like deuterium
- 26. number that is equal to the number of protons in the nucleus
Down
- 2. reactions that release heat
- 3. bonds that hold atoms together
- 4. particles or building blocks of elements
- 6. substances that increase the rate of chemical reactions without being changed
- 7. reaction that occurs when molecule is broken down into smaller molecules
- 10. particles of very tiny and do not settle out
- 12. have positive electrical charge
- 13. usually serve as catalysts
- 14. capacity to do work
- 15. energy that is stored
- 16. bonds that transfer electrons
- 18. are biological catalysts
- 19. occupies space and has mass
- 23. particles are larger and do not settle out; jello
- 25. reactions that absorb heat