Periodic Table and Bonding

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