The ability of silicon and other group 14 elements to form catenated compounds analogous to carbon is a well-established chemical fact taught in standard chemistry curricula, and thus requires no citation.
The claim states that silicon and several other elements can form extensive catenated compounds analogous to carbon. This is a fundamental chemical fact regarding group 14 chemistry (silanes, germanes, etc.) and falls under common knowledge in chemistry. Per the instructions, common knowledge claims require no citation and return COMMON_KNOWLEDGE.