Metal-metal bonding is more frequent in 4d or | vedclass

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(B) In the $d$-block elements,metal-metal bonding is more extensive in the $4d$ and $5d$ series compared to the $3d$ series. This is primarily because

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the large size of the orbitals which participates in the metal-metal bond formation

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(B) In the $d$-block elements,metal-metal bonding is more extensive in the $4d$ and $5d$ series compared to the $3d$ series. This is primarily because the $4d$ and $5d$ orbitals are larger in size and more diffuse than the $3d$ orbitals. Due to their larger size,these orbitals can effectively overlap with each other to form stronger metal-metal bonds. Therefore,the correct reason is the large size of the orbitals which participate in the metal-metal bond formation.

Metal-metal bonding is more frequent in $4d$ or $5d$ series than in $3d$ series due to

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