PERIODIC CLASSIFICATION OF ELEMENTS

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Across
  1. 3. Groups in modern periodic table
  2. 6. Halogens belong to this group of modern periodic table
  3. 8. This classification worked well for first 20 elements
  4. 10. Periods in modern periodic table
  5. 11. Shortest period of modern periodic table
Down
  1. 1. The number of electrons present in the valence shell of an atom of an element
  2. 2. Longest period of modern periodic table
  3. 4. Alkaline earth metals belong to this group of modern periodic table
  4. 5. SHELL The outermost shell of an atom of an element
  5. 7. These gases were discovered very late because of their low reactivity
  6. 9. Incomplete period of modern periodic table