Crossword 1: Atoms and Elements

123456789101112131415161718192021222324252627282930
Across
  1. 1. O
  2. 5. spherical layer outside the nucleus where electrons can be
  3. 10. He
  4. 11. substance made of one type of atom
  5. 17. Na
  6. 19. H
  7. 20. Li
  8. 21. C
  9. 25. N
  10. 26. groups 1-2 of the periodic table
  11. 28. neutral subatomic particle in the atomic nucleus
  12. 29. one of the 18 columns on the periodic table
  13. 30. center of the atom made of protons and neutrons
Down
  1. 2. negatively charged subatomic particle outside the nucleus
  2. 3. Ar
  3. 4. S
  4. 6. Si
  5. 7. F
  6. 8. P
  7. 9. Be
  8. 12. Ne
  9. 13. groups 13-18 of the periodic table
  10. 14. Al
  11. 15. Cl
  12. 16. one of the 7 rows of the periodic table
  13. 18. Mg
  14. 22. basic building block of matter
  15. 23. B
  16. 24. positively charged particle in the atomic nucleus
  17. 27. number of protons in the nucleus of an atom