Answer:
Nitrogen
Electronegativity difference between carbon and nitrogen is very less. So carbon can form covalent bond with nitrogen cery easily. Carbon-nitrogen covalent bond is one of the most abundant bonds in organic chemistry and biochemistry. Electronegativity difference between carbon- oxygen and carbon-halogen is high. So carbon forms polar covalent bond with oxygen and halogens, therefore these bonds are less stable.
Explanation:
