The types and quantities of silicon compounds determine the simplified form of silicon-based life, and the elemental properties of silicon itself are the fundamental reason why silicon-based life cannot appear in a high civilization.
Although modern "alchemists" have all kinds of reagents available, many silicon analogues of carbon compounds just cannot be formed. Thermodynamic data confirm that these analogues are often too unstable or too active. However, silicon compounds are still widely used.
Some of these structures look even alive. But the chemicals needed to create life forms simply don't exist. The complex dance of life needs a chain reaction. These reactions can only take place in a narrow temperature and pH range. Considering these limitations, it is difficult to form silicon-based life.
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The bonding ability between silicon and other elements is poor. The limit of silicon atom in silicon compound is 8, which leads to poor stability, so the molecular formula of silicon element cannot be too complicated. However, the types of chemical raw materials that silicon-based life can use to shape life are extremely limited, which greatly limits the development of silicon-based life.
In addition, silicon has a huge defect, that is, it has a strong binding force with oxygen! The content of oxygen is very rich, while the content of silicon oxide is extremely stable! Therefore, their body structure compounds are often mainly silicon dioxide.
Imagine that if it were not for this compound, their bodies would be easily damaged by oxidation. All rocky planets are extremely rich in oxygen! Therefore, the properties of silicon-based elements doomed the development of this life form to be extremely limited.