Which molecule has a triple bond between atoms? 1. O2 2. N2 3. CO2 4. H2O

1. In the oxygen molecule O₂ there is a double bond O = O, a covalent polar bond.

2. In a nitrogen molecule N₂ there is a triple bond N≡N, because 3 p-orbitals of two nitrogen atoms, when combined into a molecule, give 3 bonding (1 sigma and 2 pi) and 3 antibonding orbitals (1 sigma and 2 pi) … Thus, 6 electrons in p-orbitals of atoms are divided into three bonding orbitals.

3. In a molecule of carbon dioxide CO₂ double bonds O = C = O, because the bond is again covalent polar.

4. In the water molecule H₂O there is also a double bond Н-О-Н – a covalent polar bond.

Answer: 2. N2