Chemistry Vocab Puzzle

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Across
  1. 5. Subatomic particles in the nucleus with no charge
  2. 6. Subatomic particles in the nucleus with a positive charge
  3. 8. A row of elements on the Periodic Table
  4. 10. Element Number 1
  5. 11. A radioactive atom that can be split in half
  6. 13. The kind of bond where charged atoms are attracted to each other
  7. 14. When atoms bond by sharing two electrons at the same time
  8. 16. A scientist who won two Nobel Prizes for her work with radioactivity
  9. 17. When an element is so big, it breaks off pieces of itself as radiation
  10. 18. The kind of bond where atoms share electrons
Down
  1. 1. Subatomic particles with a negative charge
  2. 2. When a large atom splits in half, releasing energy
  3. 3. When two hydrogen atoms merge into one, releasing energy
  4. 4. An atom that has an electric charge due to missing an electron
  5. 7. A scientist who led the team that invented atomic (nuclear) bombs
  6. 9. The outer shell of electrons around an atom
  7. 12. Element Number 2
  8. 15. An atom that has an electric charge due to an extra electron