Question

Give reason why carbon can neither form \( C^{4+} \) cations nor \( C^{4-} \) anions but forms covalent compounds.

Hint:

Carbon's small size and relatively high ionization energy make it difficult to form \( C^{4+} \) and \( C^{4-} \) ions. Instead, it forms stable covalent compounds.

Answer 1

Reason: Carbon cannot form \( C^{4+} \) or \( C^{4-} \) ions because it has a relatively high ionization energy (for \( C^{4+} \)) and a relatively low electron affinity (for \( C^{4-} \)). As a result, it is energetically unfavorable for carbon to lose 4 electrons or gain 4 electrons. Instead, carbon forms covalent bonds by sharing electrons with other elements to achieve a stable electron configuration, typically forming compounds like methane (\( CH_4 \)).