MCQs – Periodic Classification Of Elements And Periodicity Of Properties

By: Prof. Dr. Fazal Rehman | Last updated: May 23, 2025

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1. : In Mendeleev’s periodic table, elements are arranged in the increasing order of their



2. : The law of triads was proposed by



3. : Lothar Meyer plotted a graph showing variation of



4. : Elements in the same vertical group of the periodic table have same



5. : The elements having low ionization energy are



6. : What is the number of elements in each of the long periods of periodic table?



7. : The amount of energy released by absorbing one electron in the valence shell is



8. : Which block of the periodic table contains maximum number of metals?



9. : The element having electronic configuration [Kr] 4d10, 4f14, 5s2, 5p6, 5d1, 6s2 belongs to



10. : Which group contains elements that exist as monoatomic molecules?



11. : An element with atomic number 20 is placed in which period of the periodic table?



12. : The decrease in atomic radius is small when we travel from left to right in transition elements. This is due to



13. : In the modern periodic table, the period indicates the value of



14. : Which of the mentioned elements is more metallic?



15. : What is the highest electronegative element in the periodic table?



16. : Which of the mentioned does not exhibit the periodicity in properties of an element?



17. : Which of the mentioned elements has properties like that of P?



18. : The most electronegative element of the third period is



19. : Which one of the following groups consists entirely of non-metals?



20. : Which of the mentioned ions has the highest value of ionic radius?



21. : The element radium belongs to which of the following?



22. : Which of the mentioned elements does not form any compound?



23. : Lithium and magnesium exhibit diagonal relationship because they have similar



24. : The element whose electronic configuration is 1s², 2s², 2p⁶, 3s², 3p⁶, 3d¹⁰, 4s² is a



25. : Which period of the periodic table is the longest?



26. : All are periodic properties excluding _____.



27. : Which of the mentioned is a chalcogen?



28. : Which of the mentioned sets of elements does not belong to same group?



29. : Electronegativity of elements while moving across a period from left to right



30. : Due to _______ atomic radii decrease from left to right in the periodic table.



31. : Atomic radii increase down the group. This is due to



32. : Which of the mentioned factors affect ionization energy?



33. : Which of the mentioned elements have highest value of electron affinity?



34. : What is the correct order of ionization energy?



35. : Which of the mentioned elements is a metalloid?



36. : Which of the mentioned remains unchanged on descending a group in the periodic table?



37. : Which of the mentioned has greatest size?



38. : In the long form of periodic table, elements are arranged according to which order?



39. : Which of the mentioned is most basic oxide?



40. : The electron affinity of members of oxygen family is

42. : In graph of atomic volume versus atomic weight, the elements corresponding to peaks in the curve belong to



43. : What is the correct order of ionic radii for the following ions?

46. : Which of the mentioned ions is smallest in size?



47. : The electron affinity order of the halogens is

49. : Who proposed the Law of octaves?



50. : According to ______, the atomic mass of the middle element is the average of the atomic masses of the other two elements.



51. : Which of the mentioned is a strong reducing agent in aqueous solution?



52. : Which of the mentioned oxides is most acidic?



53. : Which of the mentioned elements would have the lowest first ionization energy (IE)?



54. : Which of the mentioned has highest electron affinity?



55. : The one with largest size is



56. : Which of the mentioned iso-electronic species has the highest ionization energy?



57. : Which of the mentioned iso-electronic ions would require least energy for the removal of electron?



58. : The ionization energy of nitrogen is more than that of oxygen because



59. : Highest ionization potential is shown by



60. : Which is the element with highest electron affinity among halogens?



61. : Which is the more dense element in the periodic table?



62. : The element with the highest ionization potential is



63. : Which of the mentioned metals exhibits more than one oxidation state?



64. : Which of the mentioned has least electron affinity?



65. : Which is the most abundant element on the earth?



66. : Which of the mentioned generally increases on going from top to bottom in a group?



67. : Which of the mentioned elements is strongest oxidizing agent?



68. : Be has diagonal relationship with



69. : Which of the mentioned elements has highest ionization energy?



70. : The first ionization energy of Mg is lower than _____ .



71. : In a period, the element with highest electron affinity belongs to which group?



72. : Which of the mentioned element is most electropositive?



73. : Which of the mentioned ions does not have the electronic configuration same as that of neon?



74. : Which of the mentioned represents the correct order of ionic radii?



75. : What is the strongest reducing agent in the periodic table?



76. : The magnitude of electron affinity depends on



77. : What is the correct order of electron affinities of Si, P and Cl?

79. : Electron affinities of halogen are in the order

81. : Ca ion is isoelectronic with which of the following?



82. : Which of the mentioned group shows highest ionization potential?



83. : Which of the mentioned is most electronegative?



84. : Which is the element having highest electron affinity among halogens?



85. : Which of the mentioned is the heaviest element?



86. : Which of the mentioned elements is not artificial?



87. : Ionization potential depends on



88. : Which of the mentioned elements has highest heat of atomization?



89. : Which of the mentioned is a bridge element?



90. : Which one of the following periodic groups consists entirely of metals?



 

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