Daniel Hubbard's science crossword

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Across
  1. 6. the least common element on earth
  2. 7. the smallest planet in our orbit
  3. 8. the cheapest element on the periodic table
  4. 9. the planet not considered a planet
  5. 11. round planet mostly covered in water
  6. 13. a planet with a ring around it
Down
  1. 1. biggest planet in our orbit
  2. 2. A positively charged subatomic particle located in the nucleus
  3. 3. A group of atoms held together by chemical forces
  4. 4. the most expensive element on the periodic table
  5. 5. a substance that cannot be broken down into simpler substances by chemical means
  6. 10. the most used element on the periodic table
  7. 12. a mixture or solution
  8. 14. the least used element on the periodic table