Chemistry Puzzle

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