9.1.2 The types of covalmd 1.o bonds: o bonds arise from the overlap of atomic orbits along the internuclear axis..(头碰头重叠). s·s轨道形成键 Symmetry of o bond:o symmetry,i.e., rotation of any angle around the x axis, both shape and symbols are unchanged 8-p,轨道形成。键 o bonds have much overlap of atomic orbits along the internuclear axis.1.σ bonds： σ bonds arise from the overlap of atomic orbits along the internuclear axis. (头碰头重叠). Symmetry of σ bond:σ symmetry, i.e., rotation of any angle around the x axis, both shape and symbols are unchanged σ bonds have much overlap of atomic orbits along the internuclear axis. 9.1.2 The types of covalent bond