What gives carbon the ability to form chains that are almost unlimited in length?

it has 4 electrons surrounding it. Every electron wants to be bonded to another electron. That means every atom want 8 electrons total. Carbon on its own only has 4 electrons. That means it can make 4 bonds.

Explanation: it has 4 electrons surrounding it. Every electron wants to be bonded to another electron. That means every atom want 8 electrons total. Carbon on its own only has 4 electrons. That means it can make 4 bonds.

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