Question

why does carbon form only covalent bonds

Answer 1

Covalent bonds are formed by sharing of electrons and carbon also share electrons.

Answer 2

carbon form only covalent bonds
Because carbon has 4 electrons in its outermost shell (and because each covalent bond requires a donation of 1 electron, per atom, to the bond) carbon has exactly four bonds to make, and is only stable if all 4 of these bonds are used.

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