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.

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