Background: The valency of an atom in a molecular structure is the number of its neighboring atoms. A large
number of valency based molecular invariants have been conceived, which correlate certain physio-chemical properties like
boiling point, stability, strain energy and many more of chemical compounds.
Objective: Our aim is to study the valency based molecular invariants for four hexa chemical structures, namely hexagonal
network, honeycomb network, oxide network and silicate sheet network.
Method: We use the technique of atom-bonds partition according to the valences of atoms to find results.
Results: Exact values of valency-based molecular invariants, namely the Randić index, atom bond connectivity index,
geometric arithmetic index, harmonic index, Zagreb indices, Zagreb polynomials, F-index and F-polynomial are found for
four hexa chemical structures.