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Science Crossword Challenge

26 words

Across

  • 2. Two or more atoms bonded together
  • 4. Injection that prevents disease
  • 5. Gas we breathe to survive
  • 7. Temperature scale where water freezes at zero
  • 10. Physics of very small particles
  • 12. Fourth state of matter
  • 14. How plants convert sunlight to food
  • 16. Pure substance on the periodic table
  • 17. Gas making up 78% of atmosphere
  • 18. Complete set of DNA in an organism
  • 21. Element essential to all life
  • 22. Force that keeps us on Earth
  • 24. Noble gas that makes balloons float

Down

  • 1. Center of an atom
  • 3. Preserved remains of ancient life
  • 6. Uncharged particle in an atom
  • 8. Nuclear reaction powering the sun
  • 9. Negatively charged atomic particle
  • 11. Splits white light into colors
  • 12. Positively charged atomic particle
  • 13. Splitting an atomic nucleus
  • 15. Range of light wavelengths
  • 19. Protein that speeds up reactions
  • 20. Water movement through a membrane
  • 23. Electric potential difference
  • 24. Lightest and most abundant element
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