Here is a matrix formed by the lattice vectors and are the cartesian unit vectors. This functional form has no physical interpretation, but it captures some of the properties of the Coulomb interaction, such as the periodicity of the crystal lattice and infinite energy when two atoms overlap. Since the metal-nonmetal bond properties and d bands are determined by several unpaired and paired d-orbitals we propose the use of the Orbital field matrix (OFM) as a descriptor of the electronic structure of the atomic system. The representation of atoms and surrounding environments is derived by converting the standard notation into a onehot-vector, using a dictionary of the valence subshell orbitals. The vector consists of elements with the values of 0, except a single element used uniquely to identify the word. The representation of an atom is then converted from the standard notation into a one-hot-vector O atom by using a dictionary of the valence subshell orbitals: D = s 1 , s where O k is the representation vector of atom k and w k is the weight of this atom, which measures the contribution of the atom. An atom at site p in a chemical environment can be represented using the OFM as follows: