Tendency for catenation
Catenation is an ability of an element to form chain of atoms. The following conditions are necessary for catenation. (i) the valency of element is greater than or equal to two, (ii) element should have an ability to bond with itself (iii) the self bond must be as strong as its bond with other elements (iv) kinetic inertness of catenated compound towards other molecules.
Carbon possesses all the above properties and forms a wide range of compounds with itself and with other elements such as H, O, N, S and halogens.
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