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The D-And-f-Block Elements

Question

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Explain why iron is a transition element but sodium is not?

Solution

Iron is transition element but sodium is not because of the differentiating electron i.e. last incoming electron in iron acquires 3d orbitals to give [Ar] 3d⁶, 4s² configuration with incomplete d-sub-shell, the characteristic of transition. In Na, the differentiating electron occupies 3s¹ subshell to give [Ne] 3s¹configuration.

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?

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