Science Crossword

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Across
  1. 3. 6 protons 6 neutrons 6 electrons
  2. 4. we breath this gas
  3. 6. atomic number 49
  4. 8. a strong, hard magnetic silvery-gray metal, the chemical element of atomic number 26,
  5. 11. the same as your protons
  6. 13. subtract the atomic number from the atomic mass
  7. 14. a combination between two substances
  8. 15. the chemical element of atomic number 10
Down
  1. 1. matter made of more than one type of atom
  2. 2. atomic number 69
  3. 5. atomic mass 14.01
  4. 7. atomic number 12
  5. 9. the atomic number
  6. 10. the things that make the periodic table
  7. 12. a red-brown metal, the chemical element of atomic number 29.