Periodic table crossword

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Across
  1. 2. when you take the first two letters of peanut butter you get the atomic symbol
  2. 3. When you take the first two letters from cucumber you get the atomic symbol
  3. 5. what is the character from Wizard of Oz that wants a heart made of
  4. 7. Nuclear????????????
  5. 8. when you take the first two letter of tin that is the atomic symbol
  6. 10. what is the element with an atomic symbol of fe
  7. 11. When you breathe it in its keys your voice very high pitch
  8. 12. you get this when you get first
Down
  1. 1. when you minus the mass number to the atomic number you get 159
  2. 4. in h2o what is the o in it
  3. 6. what is super man weakness
  4. 9. metalloids with a symbol si