In the series $S c(Z=21)$ to $Z n(Z=30)$, the enthalpy of atomisation of zinc is the lowest, i.e., $126 \mathrm{kJJ} \mathrm{mol}^{-1}$. Why?

Question

In the series $S c(Z=21)$ to $Z n(Z=30)$, the enthalpy of atomisation of zinc is the lowest, i.e., $126 \mathrm{kJJ} \mathrm{mol}^{-1}$. Why?,

MARKS App · Accepted Answer

In $3 d$ series from $\mathrm{Sc}$ to $\mathrm{Zn}$, all elements have one or more unpaired $\mathrm{e}^{-1} \mathrm{~s}$ except $\mathrm{Zn}$ which has no unpaired electron as its outer $\mathrm{EC}$ is $3 d^{10} 4 s^2$. Hence, the intermetallic bonding is weakest in zinc. Therefore, enthalpy of atomisation is lowest.

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