ABC graphs

ABC graphs
In Chemistry


Vladislav Ivaništšev


ABC graphs is a general name for diagrams showing Atom symbols, Bonding paths, atomic Charges, lone electrons (with Dots), and empty orbitals (with Ellipsis). Specific information shown on a given diagram is reflected in its name, so one may refer to AB, ABC, ABCD or ABCDE graphs.

An AB graph is a molecular graph analogues to a ball-and-stick model, yet it shows atoms with symbols and bonding paths with single lines (instead of balls and multiple sticks).

For all graphs more complicated than AB, let us agree that each drawn line corresponds to a σ-bond sharing of a pair of electrons. Then, to draw a structure one should use simple rules for determining the atomic charges, number of lone electrons, and empty orbitals.

Table of ContentsEdit

Drawing examplesEdit

Structure–property relationsEdit

Chemistry of elementsEdit