Crossword Puzzle

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Across
  1. 2. Metals in Group 2.
  2. 5. A repeating pattern or cycle.
  3. 6. A soft metal used in cans, symbol Sn.
  4. 8. Element symbol Na.
  5. 10. Number equal to protons + neutrons.
  6. 12. Path or region electrons move in.
  7. 13. Energy level where electrons are found.
  8. 15. Element with atomic number 10.
  9. 17. State of matter with particles far apart.
  10. 18. Horizontal line on the periodic table.
  11. 19. Atoms of same element with different neutrons.
  12. 21. Elements 57–71 series.
  13. 24. Charged atom.
  14. 25. Region where electrons move.
  15. 27. Center of an atom.
Down
  1. 1. Metals in Group 1.
  2. 2. Total number of protons in an atom.
  3. 3. Element that makes up most of air, symbol N
  4. 4. Vertical columns on the periodic table.
  5. 7. Element with symbol Fe
  6. 9. A yellow metal, symbol Au.
  7. 10. Amount of matter in an object
  8. 11. Table organizing all known elements.
  9. 14. Positively charged particle.
  10. 16. Element with symbol O.
  11. 17. Vertical column on the periodic table.
  12. 20. Negatively charged particle.
  13. 22. Smallest unit of matter.
  14. 23. One horizontal cycle on the periodic table.
  15. 26. Element symbol He.