Why can carbon form polymers but silicon cannot?

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sreesans
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why carbon can form polymers and sillicon not? though both are tetra valent. explain this based on its orbital and bonding energies
 
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Are you sure there are no silicon polymers? (Hint: look up silicones)
 
In silicones Si atoms are not directly connected, they are connected through oxygen atoms - while carbon chains are a backbone of many carbon based polymers. I guess that's what the question aims at.