periodic table and radioactivity crossword

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Across
  1. 2. have some properties of metals and some of nonmetals
  2. 5. when nonmetals react with metals they generally
  3. 9. 2 protons and 2 neutrons given off during decay
  4. 11. fast moving, negatively charged particle given off during decay
  5. 13. only conduct electricity under certain conditions
Down
  1. 1. group 18, nonreactive
  2. 3. the amount of time it takes for half of the radioactive atoms in an object to decay
  3. 4. found on right side of periodic table, except hydrogen
  4. 5. most penetrating form of radiation
  5. 6. only nonmetal on left of periodic table
  6. 7. a diamond is pure __________
  7. 8. group 17, the most reactive nonmetals
  8. 10. the process through which bacteria convert atmospheric nitrogen to forms plants can use
  9. 12. when isotopes are unstable, this happens