Science

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Across
  1. 2. 1st on the periodic table
  2. 3. used to test temperature
  3. 6. indicator used to test ph
  4. 11. shell outer part of atom
  5. 12. green pigment found in plants
  6. 15. protons,neutrons, electrons
  7. 17. acid acid found in fruits
  8. 18. presence of ions cause this to occur
  9. 19. substance made up of 2 or more atoms
  10. 21. cannot be created or destroyed
  11. 22. brain of cell
Down
  1. 1. chemical reaction in plants that creates glucose
  2. 4. any substance made up of 1 element
  3. 5. warming caused by pollution
  4. 7. fire
  5. 8. positive or negative charged atom
  6. 9. scale used to measure acidity
  7. 10. a sugar made from plants
  8. 13. rain bad for environment and is caused by excessive amounts of sulfur and nitrogen in the air
  9. 14. acid causes heart burn by passing back up the oesophagus
  10. 16. needed for humans and animals to live
  11. 20. group of atoms of the same element clustered together