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The D-And-f-Block Elements

Question
CBSEENCH12007132
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What are inner transition elements? Decide which of the following atomic numbers are the atomic numbers of the inner transition elements: 29, 59, 74, 95, 102, 104

Solution

Inner transition metals are those elements in which the last electron enters the f-orbital also transition elements are the elements which have partly filled f-orbitals. These are also called f-block elements. There are two series (each of 14 elements) of inner transition elements..

(i) Lanthanoids (also called 4f series). These are from atomic numbers 58-71.

(ii) Actinoids (also called 5f series ). These are from atomic numbers 90-103

Among the given atomic numbers, only 59, 95 and 102 are the atomic numbers of inner transition elements. The other three atomic numbers represent the transition elements.

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

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?

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?

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