Question

In group 14 the tendency for catenation decreases with increasing atomic number

Answer 1

Here is your answer:

The atomic size increases and hence the strength of the element-element bond, i.e., the bond dissociation enthalpy decreases steadily.As we move down the group 14, the atomic size increases and hence the strength of the element-element bond, i.e., the bond dissociation enthalpy decreases steadily. Consequently, the tendency for catenation decreases down the group with increasing atomic number.