Stem Crossword Puzzle

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Across
  1. 3. Solid Element
  2. 5. Empty space Protons
  3. 7. gaining information
  4. 8. Explaining something based on General Principles
  5. 10. Discovered Electrons
  6. 11. an Explanation
Down
  1. 1. set of rules
  2. 2. evidence of reasoning
  3. 4. insert something of a different kind into something else
  4. 6. predicting with past experience or knowledge
  5. 9. Electrons
  6. 12. future guest