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Chemistry 108: Electronic Configurations and Atomic/Ionic Radii of Lanthanum and Lanthanoids

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Chemistry 108: Electronic Configurations and Atomic/Ionic Radii of Lanthanum and Lanthanoids

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Questions and Answers

What causes the almost identical radii of Zr and Hf?

Lanthanoid expansion

Atomic number increase

Lanthanoid contraction (correct)

Transition series expansion

What is the predominant oxidation state for lanthanoids according to the text?

+3 (correct)

Which lanthanoid exhibits both +2 and +3 oxidation states?

Dysprosium

Samarium

Promethium

Europium (correct)

Why does Ce(IV) form favorably in compounds according to the text?

Extra stability of empty f subshell Signup and view all the answers

Which lanthanoid exhibits the +4 oxidation state only in oxides?

Terbium Signup and view all the answers

Which electronic configuration is common among lanthanoids?

6s2 and variable occupancy of 4f level Signup and view all the answers

What is the general formula for the electronic configurations of tripositive ions of lanthanoids?

4f n (n = 1 to 14) Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers