Lanthanoids and actinoids electronic configuration oxidation states and contraction - One Line Questions

1. The electronic configuration of Lutetium (Lu) is [Xe] 4f^14 5d^1 6s^2. Its common oxidation state is: — +3
2. Which of the following is a common oxidation state for most lanthanoids? — +3
3. Which is the most common oxidation state for actinoids? — +3
4. The compound UO2 is an example of Uranium in which oxidation state? — +4
5. The electronic configuration of Gadolinium (Gd) is [Xe] 4f^7 5d^1 6s^2. Its common oxidation state is: — +3
6. The compound PuO2 is an example of Plutonium in which oxidation state? — +4
7. Actinoids form aqueous ions with oxidation state +3, +4, +5, +6, and +7. The stability order of these oxidation states is generally: — +3 > +4 > +5 > +6 > +7
8. The decrease in atomic radius across the lanthanoid series is approximately: — 0.01 Å per element
9. The filling of electrons in which subshell is characteristic of lanthanoids? — 4f
10. The filling of electrons in which subshell is characteristic of actinoids? — 5f
11. What is the general electronic configuration of lanthanoids? — 4f^(1-14) 5d^(0-1) 6s^2
12. The general electronic configuration of actinoids is: — 5f^(1-14) 6d^(0-1) 7s^2
13. Which element marks the beginning of the actinoid series? — Actinium (Ac)
14. Which element marks the end of the actinoid series? — Lawrencium (Lr)
15. Actinoid contraction is more pronounced than lanthanoid contraction due to: — Poorer shielding by 5f electrons compared to 4f electrons
16. The trend in ionic radii across the actinoid series is similar to that of the lanthanoids, but generally more pronounced due to: — Poorer shielding of 5f electrons
17. The oxidation state +2 is relatively stable for which lanthanoid? — Sm
18. Which of the following lanthanoid ions is diamagnetic? — Lu^3+
19. Which lanthanoid ion is known to have a stable +2 oxidation state? — Eu^2+
20. The basicity of the oxides of lanthanoids decreases as the atomic number increases. Which oxide is the most basic? — La2O3
21. Which lanthanoid exhibits a stable +4 oxidation state due to its f^0 configuration? — Cerium (Ce)
22. Actinoids exhibit a greater number of oxidation states compared to lanthanoids due to: — Closely spaced energy levels of 5f, 6d, and 7s orbitals
23. Which lanthanoid ion is known to have a stable +4 oxidation state? — Ce^4+
24. Which lanthanoid exhibits a stable +2 oxidation state due to its f^14 configuration? — Ytterbium (Yb)
25. Which lanthanoid has the electronic configuration 4f^7 5d^1 6s^2? — Gadolinium (Gd)
26. Which of the following is NOT a characteristic of actinoids? — Generally less reactive than lanthanoids
27. What is the primary consequence of lanthanoid contraction? — Similar chemical properties of elements in subsequent transition series
28. Which of the following ions has the smallest radius among the lanthanoids? — Lu^3+
29. Which of the following lanthanoid ions is paramagnetic? — Eu^3+
30. The basicity of oxides and hydroxides decreases in the order: — La(OH)3 > Ce(OH)3 > Pr(OH)3 > Nd(OH)3
31. Lanthanoid contraction leads to a significant difference in basicity between: — La(OH)3 and Lu(OH)3
32. The chemical similarity between Zr (4d) and Hf (5d) is attributed to: — Lanthanoid contraction
33. Which element marks the beginning of the lanthanoid series? — Lanthanum (La)
34. Which element marks the end of the lanthanoid series? — Lutetium (Lu)
35. The metallic radii of Zr (4d) and Hf (5d) are very similar because: — Of lanthanoid contraction
36. The phenomenon of lanthanoid contraction is due to: — Poor shielding of nuclear charge by f-electrons
37. Which pair of elements have very similar properties due to lanthanoid contraction? — Zr and Hf
38. Lanthanum (La) and Yttrium (Y) are often grouped together despite La being a lanthanoid and Y not. This is due to: — Similar chemical properties
39. The oxidation state +4 is relatively stable for which lanthanoid? — Tb
40. Actinoids are generally more reactive than lanthanoids because: — Their 5f electrons are less effectively shielded
41. Which of the following statements about actinoids is incorrect? — Their compounds are usually diamagnetic.
42. Which of the following statements about lanthanoids is incorrect? — Their compounds are generally colorless.
43. Which actinoid is known for its +6 oxidation state in compounds like UO3? — Uranium (U)
44. The element with electronic configuration [Rn] 5f^14 6d^1 7s^2 is: — Lawrencium (Lr)
45. Which of the following actinoids is commonly found in +7 oxidation state? — Neptunium (Np)
46. Which element is the first member of the actinoid series to show a stable +7 oxidation state? — Neptunium (Np)
47. The element with electronic configuration [Rn] 5f^3 6d^1 7s^2 is: — Neptunium (Np)
48. Which lanthanoid has the electronic configuration 4f^14 6s^2? — Ytterbium (Yb)
49. Which of the following pairs of elements would have similar properties due to actinoid contraction? — La and Ac
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