Across
- 4. Space where electron exists
- 6. Electron energy level
- 7. Atom with extra or missing electrons
- 10. Lightweight particle like electron
- 13. Noble gas with two protons
- 18. Mass of protons/neutrons unit
- 19. Displays all known elements
- 21. Neutral particle in nucleus
- 22. Force holding nucleus together
- 23. Column in periodic table
- 25. Electron gains energy level
- 27. Positive charge particle
- 29. Combining nuclei to form one
Down
- 1. Energy source at sun’s center
- 2. Bond sharing electrons
- 3. Electrons in outer shell
- 5. Bond transferring electrons
- 8. Number of protons only
- 9. Contains protons and neutrons
- 11. Equal positive and negative charges
- 12. Negative charge particle
- 13. Element with one proton
- 14. Sum of protons and neutrons
- 15. Rule of eight electrons for stability
- 16. Periodic table organizer
- 17. Breaking an atom’s nucleus
- 20. Smallest unit of an element
- 22. Symbol representing element
- 24. Row in periodic table
- 26. Arrangement of electrons
- 28. Electron’s path around nucleus