1. Modern periodic law was proposed by:

2. Modern periodic table is based on:

3. Total number of periods in modern periodic table:

4. Total number of groups (IUPAC):

5. Mendeleev's periodic law was based on:

6. Elements of group 1 are:

7. Group 17 elements are called:

8. s-block consists of groups:

9. p-block contains groups:

10. Chalcogens belong to group:

11. Noble gases belong to which block?

12. Transition elements belong to:

13. 1st period has how many elements?

14. Lanthanides belong to:

15. Dobereiner grouped elements into:

16. Last electron in d-block enters:

17. Z_eff = ?

18. Shielding constant is denoted by:

19. Across a period, Z_eff:

20. NOT a true transition element:

21. f-block elements are called:

22. Actinides belong to:

23. Which increases Z_eff?

24. Alkali metals stored in:

25. Liquid metal at RT:

26. Shielding is due to:

27. Group 2 elements:

28. Metals, non-metals, metalloids all in:

29. s-block general configuration:

30. IUPAC group for nitrogen family:

31. Atomic radius across a period:

32. Largest atomic radius in period 4:

33. IE across a period:

34. Highest IE in period 3:

35. IE(N) > IE(O) because:

36. Maximum electron affinity:

37. Most electronegative:

38. Metallic character down a group:

39. Cation vs parent atom:

40. Anion vs parent atom:

41. Isoelectronic order (largest→smallest):

42. Pauling scale based on:

43. Mulliken EN formula:

44. IE₂ is always:

45. Noble gases EA is:

46. Lowest IE:

47. Non-metallic character highest at:

48. Inert pair effect in:

49. Diagonal relationship:

50. Assertion: IE(N)>IE(O). Reason: Half-filled p³.

51. Lanthanide contraction due to:

52. Valence electrons of halogens:

53. Metalloid among these:

54. Period number = ?

55. Group for p-block (except He) =

56. Noble gases EA zero because:

57. Lanthanides placed separately to:

58. Cr (Z=24) configuration:

59. Heaviest natural element:

60. Element Z=56 belongs to:

61. Most metallic:

62. Correct atomic radii order:

63. Max valence electrons:

64. Most non-metallic:

65. Non-metals found in:

66. Diagonal pair:

67. Element 110 symbol:

68. Species with largest radius:

69. [Rn]5f¹⁴6d¹⁰7s²7p⁵ → Group:

70. Completely filled d-orbital:

71. Element Z=117 belongs to:

72. CE: Noble gases → zero EA. RE: Filled orbitals.

73. Which has highest IE?

74. Fe (Z=26) block:

75. Total elements in period 6: