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Catenation i.e., linking of similar atoms depends on size and electronic configuration of atoms. The tendency of catenation in group 14 elements follows the order
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$\mathrm{C}>>\mathrm{Si}>\mathrm{Ge} \approx \mathrm{Sn}$
$\mathrm{C}>>\mathrm{Si}>\mathrm{Ge} \approx \mathrm{Sn}$
The tendency of forming long open or closed chains by combination of some atoms in themselves is known as catenation. The tendency of catenation is maximum in carbon and decreases on moving down the group.
$$
\mathrm{C}>>\mathrm{Si}>\mathrm{Ge} \approx \mathrm{Sn}>\mathrm{Pb}
$$
This is due to high bond energy of $\mathrm{C}-\mathrm{C}$ bonds. On moving down the group, atomic size increases and electronegativity decreases, hence, tendency to show catenation decreases.
$$
\mathrm{C}>>\mathrm{Si}>\mathrm{Ge} \approx \mathrm{Sn}>\mathrm{Pb}
$$
This is due to high bond energy of $\mathrm{C}-\mathrm{C}$ bonds. On moving down the group, atomic size increases and electronegativity decreases, hence, tendency to show catenation decreases.
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