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Science Crossword Puzzle

22 words

Across

  • 8. Negatively charged atomic particle
  • 9. Noble gas that makes balloons float
  • 10. Force that keeps us on Earth
  • 11. How plants convert sunlight to food
  • 14. Element essential to all life
  • 15. Center of an atom
  • 17. Gas making up 78% of atmosphere
  • 19. Cell division process
  • 20. Temperature scale where water freezes at zero
  • 21. Uncharged particle in an atom
  • 22. Injection that prevents disease

Down

  • 1. Lightest and most abundant element
  • 2. Range of light wavelengths
  • 3. Positively charged atomic particle
  • 4. Splits white light into colors
  • 5. Particle of light
  • 6. Nuclear reaction powering the sun
  • 7. Physics of very small particles
  • 12. When one celestial body blocks another
  • 13. Fourth state of matter
  • 16. Splitting an atomic nucleus
  • 18. Electric potential difference
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