CROSSWORD PUZZLE ABOUT PERIODIC TABLE

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Across
  1. 3. name of the columns of the elements
  2. 7. the lightest weight metalloids
  3. 9. negatively charged ions
  4. 11. has the atomic mass number 24
  5. 12. state of the matter of element calcium
  6. 13. the heaviest metal on the chart
  7. 14. the name of the element with the symbol "w"
  8. 15. which element is the number 12 on the periodic table
  9. 17. most of the chemical elements on the periodic table
  10. 19. surname of who arrange the known elements in order of decreasing mass
  11. 20. a gas with 8 protons and 8 neutrons
Down
  1. 1. to which element group does argon belong
  2. 2. what is the "ar" symbol for
  3. 4. which element is the number 14 on the periodic table
  4. 5. most metallic element
  5. 6. the central part of the atom
  6. 8. first chemical element on the periodic table
  7. 10. the only element in the halide family that is liquid
  8. 16. surname of inventor of the modern periodic table
  9. 18. most conductive metal element