Chemistry Puzzle

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Across
  1. 1. used to determine whether a substance is an acid or a base
  2. 3. a bond where atoms share electrons
  3. 5. a chemical that starts or speeds up a reaction
  4. 6. turn blue litmus paper red and taste sour
  5. 9. share attributes of both metals and non metals
  6. 13. are full often brittle and do not conduct heat or electricity
  7. 14. the first person to come up with a periodic table
  8. 17. The positively charged particle in the nucleus of an atom
  9. 18. the number of protons
  10. 21. these elements rarely react with others
  11. 22. a reaction that requires energy
Down
  1. 2. A bond where atoms lend or borrow electrons
  2. 4. turn red litmus paper blue and taste bitter
  3. 7. a base used to wash your hands
  4. 8. the smallest unit of an element
  5. 10. a reaction that gives off energy
  6. 11. a citrus fruit that is an example of an acid
  7. 12. the neutral particle in an atom
  8. 15. a negatively charged particle in the atom
  9. 16. are shiny and conduct heat and electricity
  10. 19. the study of how elements and their combinations
  11. 20. Has neutral pH