A) Atomic radii
B) Atomic as well as \[{{M}^{3+}}\] radii
C) Valence electrons
D) Oxidation states
E) Ionisation energy
Correct Answer: B
Solution :
The lanthanide contraction relates to atomic as well as \[{{M}^{3+}}\] radii in which the regular decrease in the size of lanthanoid ion from \[L{{a}^{3+}}\] to \[L{{u}^{3+}}\]are found.
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