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What's the difference between Carbon bonding and Carbonide bonding?

1. Why is it that Carbon (C+4 or C-4) cannot form bonds with elements like Potassium (K+) to form (CK4), but Carbide (C2-2) can: (C2K2)? What is the chemical explanation for this? They are both balanced, but one is almost (if not) impossible to create while the other is relatively easy? 2. What's the difference between Potassium (K+) and Hydrogen (H+)? Potassium cannot bond with Carbon to form (CK4) but Hydrogen can bond with Carbon, to form (CH4)? 3. Lastly, what is the explanation for Carbonide (C2-2) being able to bond with Nitrogen (N-3) to form Cyanogen? (C2N2)? Theoretically speaking, shouldn't that be an ion? i.e. ((C2N2)-8), since N2 is -6 and Carbonide is -2?

Abeer Thu, 06/13/2013 - 01:00

Carbon is a tetravalent element; it has 4 electrons available to form covalent bonds. Carbon can have the oxidation state of +4/-4 among other uncommon oxidation states. However, C2 -2 is an ion( acetylide) that results from the removal of two protons from acetylene C2H2. Acetylide can strongly bond to a metal cation to make an ionic compound such as  K2C2  with the structure K+ -C≡CK+.

Hydrogen is unlike any other element, it has only one electron, so there is not much electron shielding around the nucleus of the atom. Hydrogen is more electronegative than K, so it can bond more readily with most elements. 

C2N2 contains covalent bonds between two carbons and two nitrogens, it has the structure NC-CN. It does not have the ion C2 -2  that looks like this -C≡C

I hope this helps!