Answer the question on the basis of passage given below: For the Transition Elements.
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Which transition element have large enthalpy of atomization $ΔH_a^º\, KJ\, mol^{-1}$? |
V Ti Zn Mn |
V |
The correct answer is Option (1) → V. The transition element with the largest enthalpy of atomization \((\Delta H^o_a)\) among the given options is: Vanadium (V). Enthalpy of atomization refers to the energy required to break all the bonds in a mole of atoms in the elemental state to form individual gaseous atoms. In transition metals, the enthalpy of atomization is related to the strength of the metallic bonds, which depends on the number of unpaired electrons and the extent of d-orbital overlap. Vanadium (V) has a relatively high number of unpaired d-electrons (3 unpaired electrons in the 3d subshell), which contributes to stronger metallic bonding due to better d-orbital overlap. As a result, it has a higher enthalpy of atomization compared to the other elements listed. Titanium (Ti) also has strong metallic bonds, but Vanadium's larger number of unpaired electrons gives it a higher enthalpy of atomization than Titanium. Manganese (Mn) has paired electrons in its 3d orbital, leading to weaker metallic bonding and lower enthalpy of atomization. Zinc (Zn) has completely filled 3d and 4s orbitals (\(d^{10}\) configuration), leading to weak metallic bonding and hence the lowest enthalpy of atomization among the options. |