Chemistry Puzzle

123456789101112131415161718192021
Across
  1. 1. turn blue litmus paper red and taste sour
  2. 4. used to determine whether a substance is an acid or a base
  3. 5. share attributes of both metals and non metals
  4. 6. a bond where atoms share electrons
  5. 10. A bond where atoms lend or borrow electrons
  6. 13. the smallest unit of an element
  7. 15. a reaction that gives off energy
  8. 17. are full often brittle and do not conduct heat or electricity
  9. 18. the neutral particle in an atom
  10. 19. turn red litmus paper blue and taste bitter
  11. 20. Has neutral pH
  12. 21. the study of how elements and their combinations
Down
  1. 2. the first person to come up with a periodic table
  2. 3. a base used to wash your hands
  3. 7. the number of protons
  4. 8. a citrus fruit that is an example of an acid
  5. 9. The positively charged particle in the nucleus of an atom
  6. 11. a chemical that starts or speeds up a reaction
  7. 12. a negatively charged particle in the atom
  8. 14. are shiny and conduct heat and electricity
  9. 16. a reaction that requires energy
  10. 18. these elements rarely react with others