Across
- 1. Combining nuclei into one
- 3. Basic building block of matter
- 6. Atom with charge due to electron loss/gain
- 8. Distribution of electrons in orbitals
- 10. Particle with no electric charge
- 12. Simplest and lightest element
- 14. Energy released at star’s center
- 16. Arrangement of chemical elements
- 19. Sum of protons and neutrons
- 20. Electron energy level
- 21. Bond sharing electron pairs
- 22. Total number of protons
- 23. Particle with negative charge
- 24. Symbol representing element
- 25. Vertical column in table
- 26. Horizontal row in table
- 28. Electron cloud region
Down
- 1. Breaking nucleus into smaller parts
- 2. Particle with positive charge
- 4. Developer of element classification
- 5. Electron gains energy and jumps level
- 7. Stable set of eight electrons
- 9. Small fundamental particle
- 11. Space where electron exists
- 13. Dense core of an atom
- 15. Element with two protons and neutrons
- 17. Standard unit for atomic mass
- 18. Equal positive and negative charges
- 20. Force keeping nucleus intact
- 27. Bond transferring electrons