Periodic table crossword

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Across
  1. 3. the elements in the periodic table are organized increasing its....
  2. 5. number of groups in the periodic table
  3. 11. precious metal
  4. 14. name of group seven
  5. 16. subatomic particle with a negative charge
  6. 17. name of the atom with symbol Cl
  7. 18. atom with different amounts of protons and electrons
  8. 19. name of the group of elements that are non-reactive
  9. 20. group of metals located at the center of the periodic table
  10. 24. the orbit on which the electron moves around the nucleus
  11. 26. subatomic particle with no electrical charge
  12. 27. name of the horizontal rows in the periodic table
  13. 28. fundamental unit of matter
Down
  1. 1. the element sulfur belongs to this group
  2. 2. name of the vertical divisions in the periodic table
  3. 3. name of the group 2 in the periodic table
  4. 4. name of the element with symbol Cu
  5. 6. name of the first element of the periodic table
  6. 7. first element in the halogens group
  7. 8. its chemical symbol is C
  8. 9. name of the element in group 1, period 4
  9. 10. metals name of group one in the periodic table
  10. 12. atom with a different amount of neutrons in the nucleus than "regular" atoms.
  11. 13. number of protons in a calcium atom
  12. 15. subatomic particle with a positive charge
  13. 21. number of periods in the periodic table
  14. 22. element used in aerobic respiration
  15. 23. substance formed by the same kind of atoms
  16. 25. name of the element with atomic number 11