Single Choice

In context of the lanthanoids, which of the following statements is not correct?

ABecause of similar properties the separation of lanthanoids is not ease
BAvailability of $$4 f$$ electrons results in the formation of compounds in +4 state for all the members of the series
Correct Answer
CAll the members exhibit +3 oxidation state
DThere is a gradual decrease in the radii of the members with increasing atomic number in the series

Solution

All lanthanides belong to the same group so they exibit similar properties. 4f subshell of lanthanides is well shielded by 5d and 6s orbitals so electrons of 4f subshell don't participate in bonding. Radius of lanthanides gradually decreases as atomic number increses due to poor shielding effect od f subshell. Lanthanides usually show $$+3$$ oxidation state. So, answer is B.

SIMILAR QUESTIONS

d - block and f - block Elements

Total number of inner transition elements in the periodic table is:

d - block and f - block Elements

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being :

d - block and f - block Elements

Which of the following statements is not correct for the F block elements?

d - block and f - block Elements

Which one of the following statements related to lanthanons is incorrect?

d - block and f - block Elements

What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements : $$29, 59, 74, 95, 102, 104$$.

d - block and f - block Elements

Which is the first energy level containing f-orbitals?

d - block and f - block Elements

Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because:

d - block and f - block Elements

Although Zirconium belongs to 4d transition series and Hafnium to 5d transition series even then they show similar physical and chemical properties because:

d - block and f - block Elements

The group of elements in which the differentiating electron enters the antipenultimate shell of atoms are called:

d - block and f - block Elements

A reduction in atomic size with increase in atomic number is characteristic of ?

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