Iron Man Dies

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Across
  1. 4. two or more forms of the same element
  2. 5. a stable subatomic particle with a charge of negative energy
  3. 8. displays of chemical energy
  4. 9. an essential or characteristic
  5. 10. the smallest part of a chemical element that can exist
Down
  1. 1. a stable subatomic particle occurring in all atomic nuclei
  2. 2. the emission of energy
  3. 3. in science a model is a representation of an idea
  4. 6. the most important part of an object
  5. 7. a subatomic particle