Challenge it!

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Across
  1. 4. Share electrons
  2. 7. Makes 15% of the Periodic table
  3. 8. The formula for water
  4. 9. Produces heat, Scent, and Gas bubbles
  5. 10. The building block of life
Down
  1. 1. A group of atoms bonded together
  2. 2. Makes 75% of the Periodic table
  3. 3. The connection between two surfaces
  4. 5. How scientist find atoms present in a molecule
  5. 6. Gives and takes electrons