periodic table intro1

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12345678910111213141516171819202122
Across
  1. 2. can neither gain nor lose electrons to gain stability
  2. 4. last element of second group
  3. 5. area of the periodic table which have elements with the ability to form positive ions
  4. 8. particles present in energy levels
  5. 9. yellow lustrous least reactive metal
  6. 11. radioactive element of seventeenth group
  7. 15. lightest element in the periodic table
  8. 16. number of electrons in the valence shell to make an atom stable
  9. 17. distribution of electrons
  10. 18. the smallest particle which has the properties of an element
  11. 21. representative element of group V-A
  12. 22. area of periodic table having man made elements only
Down
  1. 1. occupy single position in the periodic table
  2. 3. cannot have complete octet even after sharing three electron pairs
  3. 6. arrangement of elements by atomic numbers
  4. 7. charge which cannot be gained by chlorine
  5. 10. element requiring two electrons in second shell to complete it
  6. 12. forms positive ion most easily
  7. 13. stable element which follows duplet rule
  8. 14. the number of protons in the nucleus of an atom which determines the chemical properties
  9. 19. column in the periodic table of elements where atoms have identical valence electrons
  10. 20. longest row of elements