Question

why C2 is not formed

Answer 1

expand on your question please.

Answer 2

why would it?

Answer 3

carbon 2 does not usually form because it would require a quadruple bond between the two atoms, and quadruple bonds do not exist. however, carbon 2 does form at extremely high temperatures and in the tails of comets. the light seen is usually an emission of diatomic carbon

Answer 4

quadruple bonds do exist, but only between metals (need a sufficiently large radius and, at least, d-orbitals). I've never heard of the last part of what you said, but sounds interesting.

Answer 5

we're talking about bonding to make an octet though, so d orbitals do not apply, as they bond extraneously and are do not contain valence electrons

Answer 6

why would bonding be restricted to the octet rule? some bonds (not all) involving the d orbitals do show covalent character.

Answer 7

its not,but in carbon bonding, there is no d orbital, and it does not relate to this problem. thta was the intended meaning.

Answer 8

you said "quadruple bonds do not exist", not "carbon can't form quadruple bonds". Just sayin'