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The discovery of group IV and V elemental Xene's which exhibit topologicallynon-trivial characters natively in their honeycomb lattice structure (HLS) hasled to extensive efforts in realising analogous behaviour in group VI elementalmonolayers. Although; it was theoretically concluded that group VI elementalmonolayers cannot exist as HLS but recent experimental evidence suggestsotherwise. In this letter we report that, HLS of group VI elemental monolayer(such as, Tellurene) can be realised to be dynamically stable whenfunctionzalised with Oxygen. The functionalization leads to, peculiar orbitalfiltering effects (OFE) and broken spatial inversion symmetry which gives riseto the non-trivial topological character. The exotic quantum behaviour of thissystem is characterized by, spin-orbit coupling induced large-gap $\approx$0.36 eV with isolated Dirac cone along the edges indicating perspective roomtemperature spin-transport applications. Further investigations of spin Hallconductivity and the Berry curvatures unravel high conductivity as compared topreviously explored Xene's. The non-trivial topological character is quantifiedin terms of the $\mathbb{Z}_2$ invaraint as $\nu =$ 1 and Chern number$\mathit{C} =$ 1. Also, for practical purposes, we report that,\textit{h}BN/TeO/\textit{h}BN quantum-wells can be strain engineered to realizea sizable non-trivial gap ($\approx$ 0.11 eV). We finally conclude that,functionalization of group VI elemental monolayer with Oxygen gives rise to,exotic quantum properties which are robust against surface oxidation anddegradations while providing viable electronic degrees of freedom forspintronic applications.

Functionalized Tellurene; a candidate large-gap 2D Topological Insulator