periodic table

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Across
  1. 3. the total distance from an atom's nucleus to the outermost orbital electron
  2. 6. horizontal row in the periodic table
  3. 8. a process that involves rearrangement of the molecular or ionic structure of a substance
  4. 10. the number of protons in the nucleus of an atom
  5. 12. rare gases that have great stability and a low reaction rate
  6. 14. positively charged particle in an atom
Down
  1. 1. negatively charged particle in an atom
  2. 2. good conductor of heat and electricity
  3. 3. the average mass of the atoms of an element measured in atomic mass unit
  4. 4. particle in an atom with no electric charge
  5. 5. the basic unit of a chemical element
  6. 7. vertical column in the periodic table
  7. 9. pure substance
  8. 11. elements that are not metals
  9. 13. the six chemical elements that make up group 1