Definition of σ bond?

Question

What is the definition of σ bond? Usually it is used to describe the bonds in organic compounds. Can we use it to describe an inorganic molecules' bonds? Thank you!

Answer 1

A single sigma bond can form between any two atoms. It is formed by the sharing of 2 electrons directly along the line between the two atoms. A sigma bond is defined as the bond that exists DIRECTLY BETWEEN the two atoms along the atomic axis. Only one sigma bond can exist between any two atoms. Sigma bonds can be found in all types of compounds, organic, inorganic, organometallic, etc.
They are the most common type of bonds found in molecules.