1. Sigma bondIn chemistry, sigma bonds (σ bonds) are the strongest type of covalent chemical bond. They are formed by head-on overlapping between atomic orbitals. Sigma bonding is most clearly defined for diatomic molecules using the language and tools of symmetry groups. In this formal approach, a σ-bond is symmetrical with respect to rotation about the bond axis. By this definition, common forms of sigma bonds are s+s, pz+pz, s+pz and dz+dz (where z is defined as the axis of the bond).
Read “Sigma bond” on English Wikipedia
Read “Σ結合” on Japanese Wikipedia
Read “Sigma bond” on DBpedia
Read “Sigma bond” on English Wikipedia
Read “Σ結合” on Japanese Wikipedia
Read “Sigma bond” on DBpedia
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