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Anuj Basnotra posted an Question
March 23, 2020 • 14:07 pm
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- IIT JAM
- Biotechnology (BT)
Enthalpy of atomisation of d block elements
please explain about the nthalpy of atomisation of the d block elements
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Abhijeet Gaurav![best-answer]()
Transition elements(d block) have a large number of valence electrons and high effective nuclear charge. Due to this, they form very strong metallic bonds. As a result of this, the enthalpy of atomisation of transition metals is high. Enthalpy of atomisation: Enthalpy of atomisation is the change in enthalpy when one mole of bonds are completely broken to obtain atoms in the gas phase. How Enthalpy of Atomization Is Calculated If pressure is held constant, enthalpy change equals the change in the internal energy of a system. So, enthalpy of atomization equals the sum of the enthalpies of fusion and vaporization. For example, for the diatomic molecule chlorine gas (Cl2), the enthalpy of atomization under standard conditions is simply the bond energy of Cl2. All that is needed to atomize the substance is to break the bonds between gaseous molecules. For sodium (Na) metal at standard conditions, atomization requires separating atoms joined by metallic bonds. The enthalpy of atomization is the sum of the enthalpy of fusion and the enthalpy of vaporization of sodium. For any elemental solid, the enthalpy of atomization is the same as the enthalpy of sublimation.