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4. d and f- block elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistry4. d and f- block elements1 Mark
MCQ
Which $d-$ block element is expected to have highest enthalpy of atomisation, among the following ?
  • A
    $Sc$
  • B
    $Mn$
  • ✓
    $V$,$Zn$
  • D
    None of these
✓

Answer

Correct option: C.
$V$,$Zn$
c
Enthalpy of atomisation is the change in enthalpy when one mole of bonds are completely broken to obtain atoms in the gaseous phase. Transition elements have high effective nuclear charge and a large number of valence electrons. Therefore, they form very strong metallic bonds as a result, the enthalpy of atomisation of transiton metal is high. Due to the absence of unpaired electrons, the inter-atomic electronic bonding is the weakest in $Zn$ and as a result, it has the least enthalpy of atomisation due to presence of $3$ unpared electros. Vanadium have the highest atomisartion enthalpy.

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