lilys amazing crossword

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Across
  1. 6. two or more forms of the same element
  2. 7. a subatomic particle found in the nucleus of every atom
  3. 9. a stable subatomic
  4. 10. representation of an idea
Down
  1. 1. the emission of energy as electromagnetic waves
  2. 2. an essential or characteristic part of something
  3. 3. a stable subatomic particle occurring in all atomic nude
  4. 4. the smallest part of a chemical element that can exist.
  5. 5. the most important part of an object
  6. 8. display of chemical elements