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The d-And-f-Block Elements
Question
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Why the transition element series show fewer oxidation states at their extreme ends e.g., Sc, Ti, Ni and Cu.

Answer

At the extreme ends of the series, either too few electrons present.
In case of (Sc, Ti) therevery few electron thus show lower oxidation state.
In case of  (Ni, Cu) number eletron is more thus all electron paired and due to this it shows less oxidation state.

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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?