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The D-And-f-Block Elements

Question

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

4f orbitals more diffused than the 5f orbitals

lesser energy difference between 5f and 6d than between 4f and 5d orbitals

more energy difference between 5f and 6d than between 4f and 5d orbitals

more reactive nature of the actinoids than the lanthanoids

Solution

B.

lesser energy difference between 5f and 6d than between 4f and 5d orbitals

Being lesser energy difference between 5f and 6d than 4f and 5d orbitals.

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

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?

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

Why are transition elements known as d-block elements?

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