Answer:
Cl2
Explanation:
Chemical bonds in general can be classified as ionic and covalent
Ionic bonds are formed by the complete transfer of electrons from one atom to the other while covalent bonds are formed by the mutual sharing of electrons.
1) In CO i.e. carbon monoxide the C and O atoms are connected by 3 covalent bonds
2) In Cl2, the Cl atoms are connected by 1 covalent bond
3) IN CO2, the central C atom is bonded to O atoms by 2 covalent bonds
4) In N2, the N atoms are connected by 3 covalent bonds.
