Super Physics Crossword

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Across
  1. 4. Name for the horizontal rows on the periodic table.
  2. 5. Scientist credited with the theory of relativity.
  3. 7. Negatively charged particle of atom.
  4. 12. Most abundant element in Earth's atmosphere.
  5. 14. Credited as the Inventor of the first practical lightbulb
  6. 15. This element makes up much of Earth's core (Fe)
  7. 16. The sun is mostly made of this element.
  8. 19. Au is the chemical symbol for this element.
  9. 20. Force that attracts any two objects with mass to each other.
Down
  1. 1. The largest mountain in the solar system is located on this planet.
  2. 2. Positively charged particle of an atom
  3. 3. Earth is located in this galaxy
  4. 6. Most H2O we've discovered on other planets is in this solid form.
  5. 8. This element is an essential building block for known life.
  6. 9. Only solar system planet that spins on its' side
  7. 10. A form of energy resulting from the existence of charged particles (such as electrons).
  8. 11. Rapid expansion of matter from a state of extremely high density and temperature that according to current cosmological theories marked the origin of the universe (2 words).
  9. 13. The chemical symbol for this element is Sn.
  10. 17. Our solar system has this many planets.
  11. 18. Light acts both as a particle and like this.