Carbon and germanium belong to the 14^{th} gr | vedclass

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(C) The coordination number of an element depends on the availability of vacant orbitals in the valence shell. Carbon is in the $2^{nd}$ period with t

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availability of low-lying $d$-orbitals in germanium

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(C) The coordination number of an element depends on the availability of vacant orbitals in the valence shell. Carbon is in the $2^{nd}$ period with the electronic configuration $1s^2 2s^2 2p^2$. It lacks vacant $d$-orbitals,limiting its maximum covalency to $4$. Germanium is in the $4^{th}$ period with the electronic configuration $[Ar] 3d^{10} 4s^2 4p^2$. Due to the presence of vacant $d$-orbitals,germanium can expand its coordination number beyond $4$.

Carbon and germanium belong to the $14^{th}$ group. The maximum coordination number of carbon is less than germanium,because of

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