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(B) The melting points of transition elements are related to the strength of metallic bonding,which depends on the number of unpaired $d$-electrons av

Vedclass · Accepted Answer

$Cr > Mn$

Vedclass · Answer

(B) The melting points of transition elements are related to the strength of metallic bonding,which depends on the number of unpaired $d$-electrons available for bonding. In the $3d$ series,$Cr$ $(3d^5 4s^1)$ has six unpaired electrons,leading to strong metallic bonding and a high melting point. $Mn$ $(3d^5 4s^2)$ has a stable half-filled $d$-subshell,which makes the $d$-electrons less available for metallic bonding,resulting in a significantly lower melting point compared to $Cr$. Therefore,the correct order is $Cr > Mn$.

Which of the following is correct with respect to the melting point of a transition element?

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