Periodic table croosword

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