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The d-And-f-Block Elements

Short Answer Type

21. Why Pd is not called a transition elements?

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22. Why is the density of Zn lower than that of Cu?

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23. Atomic radius in a transition series does not vary much while that of s and p-block does. Why?

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

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25.
Why do the transition elements exhibit higher enthalpies of atomisation?

The transition element exhibit higher enthalpies of atomisation because the atoms in these elements are closely packed and held together by strong metallic bonds. The metallic bond is formed as a result of the interaction of electrons in the outermost shell. Greater the number of valence electrons, stronger is the metallic bond.

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