science term 2

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Across
  1. 3. Br is the symbol for ___
  2. 5. atomic number of carbon
  3. 6. 4th element on the periodic table
  4. 8. rows on the periodic table
  5. 10. a ___ shell around an atom
  6. 14. h20 is commonly called ___
  7. 15. compound of sodium and chloride
  8. 17. single and double ___
  9. 18. atomic number nine on periodic table
  10. 20. an electron has a ___ charge
  11. 21. humans breathe it
  12. 22. ___ reaction
  13. 23. a table of elements
Down
  1. 1. first element on the periodic table
  2. 2. 2nd element on the periodic table
  3. 4. the centre of an atom
  4. 7. a combination of elements is
  5. 9. a neutron has a ___ charge
  6. 11. everything is made up of me
  7. 12. Fe is the symbol for ___
  8. 13. a proton has a ___ charge
  9. 15. a type of chemical reaction
  10. 16. inorganic acids do not contain ___
  11. 19. amount of metals on periodic table
  12. 21. atomic number of hydrogen