We find that single atom adsorption follows the same trends seen on MoS 2 , with absorption above W more favourable than adsorption at any other site. Adsorption on the telluride monolayer is the most stable, followed by adsorption on the sulphide and then selenide monolayer; however this difference in energy is typically less than 0.10 eV. Furthermore, the adsorption energies on WX 2 monolayers differ typically by less than 0.10 eV compared to identical adsorption modes on an MoS 2 monolayer .