Across
- 3. mass cannot be created or destroyed, only _______
- 5. objects stick together after collision
- 7. the big number that can change to balance equations
- 9. elements in the same period have the same number of energy _____
- 13. mass in motion
- 14. objects bounce off each other after collision
- 15. the rows on the periodic table
- 18. negatively charged particles
- 19. the columns on the periodic table
- 20. momentum must be ______ during a collision
- 21. particle of light given off by electrons
- 23. most reactive nonmetals
Down
- 1. electrons jump from different _______ levels to gain or emit photons
- 2. elements in the same group share similar _______
- 4. the state when electrons have energy
- 6. least reactive of all elements; noble gases
- 8. ________ spectra; created when electrons jump between energy levels
- 10. electrons electrons in outer shell; determine reactivity
- 11. model used to show protons, neutrons, and electrons
- 12. most reactive metals
- 15. positively charged particles
- 16. cannot be changed when balancing equations
- 17. particle with a neutral charge
- 19. the state when electrons do not have energy
- 22. the _______ of atoms must be the same on both sides of a chemical equation