Why is enthalpy of atomisation lowest for zn in the 3d series of transition elements?
Answers
"Enthalpy of atomization:
Under standard condition one mole of gaseous atoms are formed from its elements is called enthalpy of atomization.
An element has a d- sub shells which are partially filled are called transition element. And these elements are formed at least one stable ion. All d-block elements are transition elements.
When going to left to right in the d- block increases the number of unpaired electrons. Hence increases inter molecular forces and it leads to the formation of a stronger bond between atoms resulting in higher enthalpies of atomization.
In the transition series, increasing order of enthalpies of atomization is as follows.
3d < 4d < 5d
Therefore, enthalpy of atomization lowest for “zn” in the series of 3d of transition elements."
Answer:
Due to the absence of unpaired electrons in ns and (n–1)d shells, the interatomic electronic bonding is the weakest in zinc. Consequently, zinc has the least enthalpy of atomisation in the 3d series of transition elements.