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The D-And-f-Block Elements

Question

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The reason for greater range of oxidation states in actinoids is attributed to

The radioactive nature of actinoids

Actinoid contraction

5f, 6d and 7s levels having comparable energies

4f and 5d levels being close in energies

Solution

C.

5f, 6d and 7s levels having comparable energies

Some More Questions From The d-And-f-Block Elements Chapter

Silver atom has a completely filled d orbitals (4d¹⁰) in its ground state. How can you say that it is a transition element?

In the series Sc (Z = 21) to Zn(Z = 30), the enthalpy of atomisation of zinc is the lowest i.e., 26, kJ mol. Why?

The E° (M²⁺/M) value for copper is positive (+ 0.34 V). What is possibility the reason for this?

How would you account for the irregular variation of ionisation enthalpies (first and second) in the first series of the transition elements?

Why is the highest oxidation state of a metal exhibited in its oxide or fluoride only?

Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

Explain why Cu⁺ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

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