In molecular orbital language (Section 1.11), interaction between the p orbitals leads to one bonding and one antibonding 2 molecular orbital. The 2 bonding MO has no node between nuclei and results from a combination of p orbital lobes with the same algebraic sign. The 2 antibonding MO has a node between nuclei and results from a combination of lobes with different algebraic signs, as shown in Figure 1.18, page 22.