Development of the Periodic Table

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Across
  1. 2. scientist who discovered the electron
  2. 4. scientist who coined the term “law of octaves”
  3. 8. over _ number of years in development
  4. 10. crucial element of mendeleev’s system of arranging elements
  5. 12. another name for group 7 elements
  6. 15. groups of elements according to Johann Döbereiner
  7. 16. another name for group 0 elements
  8. 19. atomic _ - the larger number next to an element on the periodic table
  9. 20. scientist who devised a list of 33 elements in 1787
  10. 22. the first element in the modern periodic table
  11. 23. number of elements identified in early periodic table in 1869
Down
  1. 1. study of chemicals
  2. 3. scientific theory first related to the periodic table by Niels Bohr
  3. 5. atomic _ - how elements were originally arranged
  4. 6. another name for group 1 elements
  5. 7. horizontal row in the periodic table
  6. 9. table designed by scientists
  7. 11. scientist who first referred to the atomic number
  8. 13. _ metals - the group of elements in the centre of the periodic table that are not listed in any group
  9. 14. spaces left in early periodic tables to predict elements that had not yet been discovered
  10. 17. element with atomic number of six
  11. 18. vertical column in the periodic table
  12. 21. Russian scientist credited with developing the periodic table