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In order to form ionic bond by carbon it needs to loose 4 eletron or to gain 4 electron which is impossible by carbon so it only form covalent bond.

carbon has valency 4 to attend noble gas configuration it need to gain or lose 4 electrons so that it would form ionic compound.if it gain 4 electrons it would be difficult for nucleus to hold 6 protons on to 10 electrons.if it lose 4 electrons it would require lot of energy tolose 4 electrons from nucleus holding 6 protons on to just 2 electrons.

Thus carbon doesnt form ionic compounds.
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Carbon has four valence electrons and to for am ionic compound, carbon should lose all the four electrons. This needs high ionisation energy and hence carbon generally shares electrons and forms covalent compounds .only carbon does form ionic compounds as in metal carbides.
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