10 Questions
What causes the almost identical radii of Zr and Hf?
Lanthanoid contraction
What is the predominant oxidation state for lanthanoids according to the text?
+3
Which lanthanoid exhibits both +2 and +3 oxidation states?
Europium
Why does Ce(IV) form favorably in compounds according to the text?
Extra stability of empty f subshell
Which lanthanoid exhibits the +4 oxidation state only in oxides?
Terbium
Which electronic configuration is common among lanthanoids?
6s2 and variable occupancy of 4f level
What is the general formula for the electronic configurations of tripositive ions of lanthanoids?
4f n (n = 1 to 14)
What is the cause attributed to the overall decrease in atomic and ionic radii from lanthanum to lutetium?
Imperfect shielding of one electron by another in the same sub-shell
What is unique about the lanthanoid contraction compared to an ordinary transition series?
Fairly regular decrease in atomic and ionic sizes with increasing atomic number
What effect does an increase in nuclear charge have along the lanthanoid series?
Shielding of one f electron by another is less than one d electron by another
This quiz covers the names, symbols, electronic configurations, atomic and ionic radii of lanthanum and lanthanoids, with a common 6s2 configuration but variable occupancy at the 4f level. Table 4.9 from Chemistry 108 Rationalised 2023-24 provides the necessary data for this topic.
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