Elements and periodic table

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Across
  1. 2. lightest element in the periodic table
  2. 5. table of elements arranged by atomic numbers
  3. 8. the smallest particle which has the properties of an element
  4. 11. area of the periodic table which have elements with the ability to form positive ions
  5. 13. highest percentage in atmosphere
  6. 14. charge which cannot be gained by chlorine
  7. 15. cannot have complete octet even after sharing three electron pairs
  8. 16. particles present in energy levels
  9. 19. distribution of electrons
  10. 23. representative element of group V-A
  11. 24. stable element which follows duplet rule
  12. 25. forms positive ion most easily
  13. 26. last element of second group
  14. 29. column in the periodic table of elements where atoms have identical valence electrons
  15. 32. yellow lustrous least reactive metal
  16. 34. occupy single position in the periodic table
  17. 35. element requiring two electrons in second shell to complete it
  18. 36. number of electrons in the valence shell to make an atom stable
  19. 38. colourless, odourless, highly flammable gas with atomic number 1
  20. 40. the number of protons in the nucleus of an atom which determines the chemical properties
  21. 43. can neither gain nor lose electrons to gain stability
  22. 44. longest row of elements
  23. 45. area of periodic table having man made elements only
  24. 46. radioactive element of seventeenth group
Down
  1. 1. has 5 electrons in the 3rd shell
  2. 3. most reactive non metals
  3. 4. an element with last two or three partially filled shells
  4. 5. a noble metal
  5. 6. arrangement of elements with same number of shells around their nucleus
  6. 7. mutual sharing of an electron pair between two atoms
  7. 9. arranged elements in periods and columns
  8. 10. a noble gas which shoes some reactions
  9. 12. name given to group 6 A elements
  10. 17. any substance which cannot be decomposed into simpler substances
  11. 18. abbreviations used in chemistry for chemical elements
  12. 20. a nuclear subatomic particle in the nucleus of an atom
  13. 21. electrostatic attractions between oppositely charged particles
  14. 22. third element in carbon family
  15. 27. they have same number of protons but different mass numbers
  16. 28. metals of group II-A
  17. 30. donot contain normal elements
  18. 31. total number of families in the periodic table
  19. 33. can gain one electron with highest difficulty to form negative ion as compared to other members of its group
  20. 37. coinage metals
  21. 39. last element in the periodic table
  22. 41. shortest period
  23. 42. number of shells of ions of chlorine and potassium are similar to it