chemistry

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Across
  1. 4. two or more elements not chemically combined
  2. 6. negative charge
  3. 10. two or more elements chemically combined
  4. 11. a grid like structure of atoms
  5. 12. positive charge
Down
  1. 1. two or more atoms chemically combines
  2. 2. byproduct of iron oxide forming
  3. 3. atomic number 1
  4. 5. unique atom
  5. 7. makes up over 70% of air
  6. 8. neutral charge
  7. 9. single atom