First slide

Transition elements

Question

Select incorrect statement:

Moderate

A

Actinides with 5f¹, 5f⁵ and 5f⁸ electronic configuration are not known.
B

Lanthanides with 4f² and 4f⁸ electronic configuration are not known.
C

Lanthanoid compounds are less basic than actinoid compounds.
D

Lanthanoid compounds have more tendency towards complex formation.

Solution

Correct (4).
Due to low charge density, lanthanoid have less tendency to form complex. The tendency to form complexes and their stability increases with increasing atomic number.

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