Explain the following observations about the transition/ inner-transition elements :
(i) There is in general an increase in density of elements from titanium (Z=22) to copper (Z=29).
(ii) There occurs much more frequent metal-metal bonding in compounds of heavy transition elements (3rd series).
(iii) The members in the actinoid series exhibit a large number of oxidation states than the corresponding members in the lanthanoid sereis

(a) Complete the following chemical reaction equations : (i) MnO_(4(aq))^(-) + C_(2)O_(4(aq))^(2-) + H_((aq))^(+) to (ii) Cr_(2) O_(7 (aq))^(2-) + Fe_((aq))^(2+) + H_((aq))^(+) to (b) Explain the following observations about the transition/inner transition elements : (i) There is in general an increase in density of element from titanium (Z = 22) to copper ( Z= 29). (ii) There occurs much more frequent metal-metal bonding in compounds of heavy transition elements ( 3^(rd) series). (iii) The members in the actinoid series exhibit a larger number of oxidation states than the corresponding members in the lanthanoid series.

Explain the following: There is an increase in density of elements from titanium (Z = 22) to copper (Z = 29) in the 3d series of transition elements.

Explain the following observations : (i) Many of the transition elements are known to form interstitial compounds . (ii) There is a general increase in density from titanium (Z =22) to copper (Z = 29). (iii) The members of the actinoid series exhibit a larger number of oxidation states than the corresponding members of the lanthanoid series.

Explain the following observations giving an appropriate reason for each. (i) The enthalpies of atomization of transmition elements are quite high. (ii) There occurs much more frequent matal-matal bonding in compounds of heavy transition metals (i.e, 3^(rd) series). (iii) Mn^(2+) is much more resistant then Fe^(2+) toawards oxidation.

Explain the following observation: (i) Generally there is an increase in density of elements from titanium (Z=22) to copper (Z=29) in the first series of transition elements. (ii) Transition elements and their compounds are generally found to be catalysts in chemical reactions.

How would you account for the following ? (i) Many of the transition elements are known to form interstitial compounds. (ii) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the correponding group members of the second (4d) series.

Assign reason for each of the following statement: (i) The largest number of oxidation states are exhibited by the elements in their row transition elements. (ii) The atomic radii decrease in Size with the increasing atomic number in the lanthanoid series

Explain the following observations: (i) Transition elements are known to form many interstitial compounds.. (ii) With the same d^4 configuration Cr^(2+) ion is reducing while Mn^(3+) ion is oxidising. (iii) The enthalpies of atomization of the transition elements are quite high.

How would 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 seconds (4d) series. (ii) There is a greater range of oxidation states among the actinoids than among the lanthanoids.

How would you account for the following : (i) Among lanthanoids , Ln(III) compounds are predominant , However, occasionally in solutions or in solid compounds , +2 and +4 ions are also obtained . (ii) The E_(M2+//M)^(@) for copper is positive (0.34V ) . Copper is the only metal in the first series of transition elements showing this behaviour . (iii) The metallic radii of the third (5d) series of transition metals are nearly the same as those of the corresponding members of the second series .