Chemistry Crossword

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Across
  1. 2. what does Si stand for
  2. 5. what is aluminium's atomic number
  3. 6. positive charges of an atom
  4. 7. glass cylinder
  5. 12. negative charges of an atom
  6. 13. protons plus neutrons
  7. 14. what the periodic table is full of
Down
  1. 1. the element He has an atomic number of
  2. 3. what element has the atomic number of 7
  3. 4. what element has the atomic number of 5
  4. 8. whats the smallest part of an atom
  5. 9. what element has the atomic number of 12
  6. 10. our bodies are made up of billions of
  7. 11. what does K stand for