New vertex-edge sombor, Nirmala and Misbalance indices

Abstract

The molecular structure of a compound contains all the information which would help to determine its chemical, biological, and physical properties. With the help of a theoretical descriptor tool known as topological indices, one can assess these properties. In this paper, we define new vertex-edge degree topological indices namely, the ve-degree Sombor index (SOve), the ve-degree Nirmala index (Nve), and the vedegree Misbalance prodeg index (MPIve). The chemical applicability of those indices have been studied and found good correlation coefficient with different physical/chemical properties of octane isomers. Further, we found the values for the standard graphs and the bounds for SOve and Nve in terms of MPIve, M??ve(G), and Fve(G).