The maximum melting point (m.p.) of the 1^{st | vedclass

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(B) $1$. In the $1^{st}$ transition series ($3d$ series), the maximum melting point is observed for $Cr$ $(Z=24)$ due to the stable $d^5$ configuratio

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$Cr$ and $Cd$

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(B) $1$. In the $1^{st}$ transition series ($3d$ series), the maximum melting point is observed for $Cr$ $(Z=24)$ due to the stable $d^5$ configuration, which leads to strong metallic bonding.$2$. In the $2^{nd}$ transition series ($4d$ series), the minimum melting point is observed for $Cd$ $(Z=48)$ due to its completely filled $d^{10}$ configuration, which results in weak metallic bonding.$3$. Therefore, the maximum melting point of the $1^{st}$ series is $Cr$ and the minimum melting point of the $2^{nd}$ series is $Cd$.

The maximum melting point $(m.p.)$ of the $1^{st}$ transition series and the minimum melting point $(m.p.)$ of the $2^{nd}$ transition series are obtained with:

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