In the context of the lanthanoids,which of the following statements is not correct?
- AThere is a gradual decrease in the radii of the members with increasing atomic number in the series.
- BAll the members exhibit $+3$ oxidation state.
- CBecause of similar properties,the separation of lanthanoids is not easy.
- DAvailability of $4f$ electrons results in the formation of compounds in $+4$ state for all the members of the series.
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$(i)$ Neptunium and Plutonium are obtained from ............ .
$(ii)$ Lanthanoid series and Actinoid series are known as ............ .
$(iii)$ The main energy level of an atom is called ............ .
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$(iii)$ The main energy level of an atom is called ............ .
$(iv)$ Elements that possess both metallic and non-metallic properties are called ............ .
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Assertion $A$: Size of $Bk^{3+}$ ion is less than $Np^{3+}$ ion.
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