In the series `Sc(Z=21)` to `Zn(Z=30)` the enthalpy of atomisation of zinc is the lowest, i.e., 126 kJ `mol^(-1)`. Why?

Explanation

To understand why the enthalpy of atomization of zinc (Zn) is the lowest among the series from scandium (Sc, Z=21) to zinc (Zn, Z=30), we can break down the explanation into several key steps:

### Step 1: Understanding Enthalpy of Atomization
The enthalpy of atomization is the energy required to convert one mole of a solid element into its gaseous atoms. It is a measure of the strength of the bonds holding the atoms together in the solid state.

**Hint:** Think of enthalpy of atomization as a measure of how tightly atoms are held together in a solid.

### Step 2: Metallic Bonding and its Relation to Atomization
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