d-Block and f-Block Elements - One Line Questions

1. The most common oxidation state of lanthanides is: — +3
2. Lanthanides are elements in which the differentiating electron enters the: — 4f orbital
3. Actinides are elements in which the differentiating electron enters the: — 5f orbital
4. The characteristic property of actinides is that they exhibit: — Variable oxidation states, with +3 being common
5. The contraction in ionic radii across the lanthanide series is known as: — Lanthanide contraction
6. The elements of the d-block are also known as: — Transition elements
7. The element Promethium (Pm) is unique among lanthanides because it is: — Artificial and radioactive
8. Which of the following lanthanide ions is colorless? — Lu³⁺
9. Which of the following is NOT considered a transition element according to IUPAC definition? — Zinc (Zn)
10. The last element of the 3d series is: — Zinc (Zn)
11. Which of the following elements is known for its resistance to corrosion and is used in stainless steel? — Chromium (Cr)
12. The lanthanides and actinides are collectively known as: — f-block elements
13. Which of the following is a common use of chromium compounds? — Electroplating
14. Which of the following is a characteristic property of d-block elements? — Variable oxidation states
15. Which of the following is a property of d-block elements that is also exhibited by f-block elements? — Formation of colored compounds
16. Which of the following is a characteristic of actinides but not typically of lanthanides? — Larger variation in oxidation states
17. The reduction potential of transition metal ions generally: — Increases across a period
18. Which of the following is NOT a d-block element? — Calcium (Ca)
19. Which of the following transition metals exhibits the highest number of oxidation states? — Manganese (Mn)
20. Which of the following d-block elements is a liquid at room temperature? — Mercury (Hg)
21. Which of the following transition metals has the highest melting point? — Tungsten (W)
22. Actinides, starting from Thorium (90) onwards, are also known as: — Transuranic elements
23. Which of the following is an actinide element? — Uranium (U)
24. The process of forming complexes by transition metals is facilitated by: — Small size and high charge density
25. The actinide series starts with Actinium (Ac) and ends with: — Lawrencium (Lr)
26. The lanthanide series starts with Lanthanum (La) and ends with: — Lutetium (Lu)
27. The element Gadolinium (Gd) is known for its strong magnetic properties and is used in: — Medical imaging (MRI contrast agents)
28. The general electronic configuration of d-block elements is: — ns² (n-1)d¹⁻¹⁰
29. The general electronic configuration of f-block elements is: — ns² np⁶ (n-1)d¹⁻¹⁰ (n-2)f¹⁻¹⁴
30. The elements in which the differentiating electron enters the (n-1)d orbital are called: — d-block elements
31. The concept of 'inner transition elements' refers to: — f-block elements
32. Which of the following is a common property of transition metal ions in aqueous solution? — Paramagnetism
33. Which period in the periodic table contains the first series of d-block elements (3d series)? — Period 4
34. Lanthanides are also known as: — Rare earth elements
35. Lanthanide contraction is due to poor shielding of: — d-electrons by f-electrons
36. The first element of the 3d series is: — Scandium (Sc)
37. The ability of transition metals to form alloys is due to: — Similar atomic sizes and crystal structures
38. The high density of transition metals is attributed to: — Small atomic radii and strong metallic bonds
39. Lanthanide contraction has a significant effect on the properties of: — The elements in the same group below them
40. The f-block elements are placed in: — Separate rows at the bottom of the periodic table
41. The maximum oxidation state exhibited by an element in the first transition series generally corresponds to: — The sum of electrons in the s and d subshells
42. The formation of interstitial compounds by transition metals is due to: — Their small atomic size and vacant interstitial spaces
43. Transition metals generally form colored compounds because: — They absorb light in the visible region due to d-d transitions
44. Which of the following is a lanthanide element? — Cerium (Ce)
45. Which actinide is used in nuclear reactors as fuel? — Uranium (U)
46. Which of the following compounds of transition metals is diamagnetic? — Sc³⁺
47. The magnetic properties of transition metals arise from: — Unpaired electrons in d orbitals
48. Which of the following is a property that distinguishes d-block elements from f-block elements? — Lanthanide/Actinide contraction
49. The catalytic activity of transition metals is due to: — Variable oxidation states and ability to form complexes
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