Periodic Table

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Across
  1. 4. the material made from the chemical equation NaCl
  2. 5. a particle with a negative charge
  3. 8. arranges elements into groups and periods
  4. 12. a particle with a positive charge
  5. 13. equal to the number of protons and neutrons
  6. 14. the horizontal (left to right) sections on the periodic table
  7. 15. the amount of matter in something
Down
  1. 1. the law of conservation of mass states matter cannot be...
  2. 2. the building blocks of life
  3. 3. particles with no charge
  4. 6. the vertical (up and down) sections on the periodic table
  5. 7. the number in front of a chemical formula
  6. 9. the basic units of elements and matter
  7. 10. represented on the periodic table by symbols
  8. 11. number 79 on the periodic table