Problem
Problem
In context of the lanthanoids, which of the following statements is not correct? a. Availability of electrons results in the formation of compounds in +4 state for all the members of the series b. There is a gradual decrease in the radii of the members with increasing atomic number in the series c. All the members exhibit +3 oxidation state d. Because of similar properties the separation of lanthanoids is not easyIntuitive explanation
The lanthanoids are a tricky family because their chemistry is dominated by a single oxidation state (+3) and very similar ionic radii, yet they have subtly different electronic configurations in their orbitals. To spot the incorrect statement, you'll need to think about what actually differs among them—things like atomic radius trends, magnetic properties from unpaired electrons, or the rare exceptions to the +3 oxidation state—rather than assuming they're all identical. The key is recognizing which chemical or physical property statement contradicts what we know about how electrons behave.
Intuitive explanation
The lanthanoids are a tricky family because their chemistry is dominated by a single oxidation state (+3) and very similar ionic radii, yet they have subtly different electronic configurations in their orbitals. To spot the incorrect statement, you'll need to think about what actually differs among them—things like atomic radius trends, magnetic properties from unpaired electrons, or the rare exceptions to the +3 oxidation state—rather than assuming they're all identical. The key is recognizing which chemical or physical property statement contradicts what we know about how electrons behave.