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The D-And-f-Block Elements

Question

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Except La³⁺, Ce⁴⁺ and Yb²⁺, Lu³⁺ all lanthanoids are paramagnetic. Why?

Solution

The paramagnetic property is because of the unpaired electron. La³⁺ and Ce⁴⁺ have 4f⁰ configuration whereas Yb²⁺ and Lu³⁺ have 4f¹⁴configuration, which makes all these four deficient of unpaired electrons and thus they all are diamagnetic whereas all rest of the lanthanoids have atleast one or more unpaired electron which makes them paramagnetic.

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

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?

Write the general electronic configuration of d-block elements.

Why do some exceptions to the general electronic configuration of d-block elements exists?

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