# What happens during the process of polymerization?

In polymerization, a monomer, for example ethylene, ${H}_{2} C = C {H}_{2}$, is subjected to conditions that clip together the carbon atoms to give a long chain polymer........
$n - {H}_{2} C = C {H}_{2} \stackrel{\text{metal catalyst}}{\rightarrow} - C {H}_{2} C {H}_{2} C {H}_{2} C {H}_{2} C {H}_{2} - e t c .$