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The atomic radii of the metals of the th...

The atomic radii of the metals of the third (5d) series of transitions elements are virtually the same as those of the corresponding members of the second (4d) series. Explain.

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In between-second transition series (4d series ) of transition series (5 series ), fourteen elements (La with Z=57 to Hf with Z=72) are present. Since these elements are involved in the lanthanoids contraction,this effect is obviously experienced by the element of 5d series also. As a result, the difference in the atoic sizes of the element belonging to the two series is negligible. These sizes are virtually the same.
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How would you account for the following? (i)The atomic radii of the metals of the third (5d) series of trasition elements are virtually the same as those of the corresponding members of the second (4d) series. (ii)The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) couple or Fe^(3+)//Fe^(2+) couple. (iii)The highest oxidation state of a metal is exhibited in itsoxide or fluoride.

How would you account for the following? (i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding member of the second (4d) serie (ii) Because oxygen and fluorine are highly electronegative elements and small in size.

How would you account for the following? (i) The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding member of the second (4d) serie (ii) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) couple of Fe^(3+)//Fe^(2+) couple. (iii) The highest oxidation state of a metal is exhibited in its oxides or fluoride.

How will you account for the following ? (i) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the corresponding group members of the second (4d) series. (ii) Lanthanoids form primarily +3 ions while actinoids usually have higher oxidation states in their compounds . Among the lanthanoids, Ln(III) compounds are predominant. However, occasionally in solution or in solid state +2 and +4 ions are obtained. Explain.

DINESH PUBLICATION-D-AND -F BLOCK ELEMENTS-Question From Board Examination
  1. La^(3+)(Z=57) and Lu^(3+)(Z=71) do not show any colour in solution. As...

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  2. Transition element act as good catalysts because

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  3. The atomic radii of the metals of the third (5d) series of transitions...

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  4. Explain why zinc is not rgardede as a transition element.

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  5. Explain why is Ce^(4+) ion a strong oxidising agent ?

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  6. Describe the oxidising property of KMnO(4) in neutral or faintly alkal...

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  7. Assing the reason for the following : (i) Transition metals generall...

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  8. In the transition series of metals, the metal which exhibits the great...

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  9. Metal-Metal bondin is more extensive in the 4d and 5d series of transi...

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  10. Why does Mn(III) undergo disproportionation reaction easily ?

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  11. How would you account for the following ? (i) Many of the transition...

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  12. The colour of the transition metal ions is due to

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  13. Why is the highest oxidation state of a metal exhibited in its oxide o...

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  14. K(2)Cr(2)O(7) is a good oxidising agent in acidic medium. Explain.

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  15. Why is potssium permanganate thermally unstable at 513 K.

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  16. The inter convertibility of chromate ion and dichromate ion in aqueous...

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  17. Complete the following equation : CrO(4)^(2-)+H^(+) to

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  18. Give reasons for the following : (i) Mn^(3+) is a good oxidising ag...

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  19. Predict which of the following will be coloured in aqueous solution ? ...

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  20. (a) Explain the structure of dichromate ion. (b) Why are cadmium sa...

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