1.

Which of the following transition metals of 3d series has the lowest melting point ?

Answer»

`Ti(Z= 22)`
`V(Z= 23)`
`Cr(Z= 24)`
`Mn(Z=25)`

Solution :In the first transition series,Mn has abnormally low melting point. This is due to the FACT that Mn has exactlyhalf-filled d-orbitals.As a result, electronic configuration is very stable, i.e., ELECTRONS areheldtightly by the nucleus so that the delocatization is less and the metallic bond ismuch WEAKER than the elements on its either side.


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