(B) Most transition elements are very hard due to strong metallic bonding involving $d$-electrons.However,elements like $Zn, Cd,$ and $Hg$ have comple

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(B) Most transition elements are very hard due to strong metallic bonding involving $d$-electrons.However,elements like $Zn, Cd,$ and $Hg$ have completely filled $d$-orbitals ($d^{10}$ configuration),which results in weak metallic bonding.Therefore,$Zn$ is a soft element compared to $Co, W,$ and $Mo$.