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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?

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26. Why is the enthalpy of atomisation increases upto the middle of the transition series and then decreases?

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27. Why are Zn, Cd and Hg softer and volatile metals?

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28.
Why does Zr and Hf exhibit similar properties?

Zr and Hf exhibit similar properties due to lanthanoid contractin. Electrons present in f subshell didn't do good shielding due to which with the increasing atomic number or increasing effective nuclear charge size gets constricted and size of Halfenium and Zirconium becomes almost equal.

2(40) = [Kr]₃₆4d² 5s², Hf(72) = [Xe]₅₄ 4f¹⁴ 5d² 6s²

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