Question

In 3d series which element has the highest enthalpy of atomisation and why

Answer 1

$ASSALAMUALAIKUM$

Sc & zn belongs to 3rd group pf periodic table. The extent ofmetallic bonding an elementundergoes decides the enthalpy of atomization. The more extensive the metallic bonding of an element, the more will be its enthalpy of atomization.

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Answer 2

In the 3d series, the V element has the highest enthalpy of atomisation.

• Enthalpy of atomisation of a species is defined as the change in enthalpy when one mole of bonds is completely broken to obtain atoms in the gaseous phase.
• The electronic configuration of V is as follows-
• I${1s}^{2} {2s}^{2} {2p}^{6} {3s}^{2} {3p}^{6} {4s}^{2} {3d}^{3}$
• Thus, the 3d orbital has 3 unpaired electrons and can form a strong metallic bond so, high energy is required to break the bond and have the highest enthalpy of atomisation.

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