Chemistry

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Across
  1. 3. of protons in the nucleus
  2. 4. average atomic mass of an element
  3. 5. number in front of a symbol tat represents the number of molecules present
  4. 8. subatomic particle with a negative electrical charge
  5. 9. substance formed as a result of chemical reaction
  6. 10. subatomic particles with a positive electrical change located in the nucleus
Down
  1. 1. shows how many atom of an element are present in a molecule
  2. 2. column of the elements on the periodic table with atomic properties
  3. 6. subatomic particle with a neutral electrical charge located in the nucleus
  4. 7. horizontal row in the periodic table were all the elements have the number of energy levels