The transition elements that has the lowest enthalpy of atomisation is:

Step-by-step solution

Z n is usually not considered as a transition element as the d-orbital electrons do not take part in reactions. This is why Zn exhibit only + 2 oxidation state. But since, it is placed in the d-block along with other transition metals, it is technically a d-block element and a transition metal. Zinc has the lowest enthalpy of atomization among the first row transition metals. Elements V C u Z n F e Enthalpy of atomization 515   K J / m o l 339   K J / m o l 216   K J / m o l 416   K J / m o l