Science Crossword

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Across
  1. 1. the protons in an atom
  2. 4. a certain substance made of specific atoms
  3. 7. neutral particle in an atoms nucleus
  4. 9. the column within the periodic tables
  5. 13. positively charged particle in atoms nucleus
  6. 14. particle found in the outermost energy level
  7. 15. two elements combined
Down
  1. 2. negatively charged particle in an atom
  2. 3. when an atoms charge is not neutral
  3. 5. the orbital patterns around a nucleus with electrons
  4. 6. the area outside the nucleus
  5. 8. the center core of an atom
  6. 10. the neutrons and protons mass combined
  7. 11. determined by valence electrons
  8. 12. building block of all matter
  9. 13. The rows within the periodic table