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Monovalent metals contain half filled band (HFB) of s-electrons. Emphasizingimportance of Coulomb repulsions in HFB in 2D and 1D monovalent systems wesketched a theory (2018) for ambient temperature granular superconductivityreported by Thapa and Pandey (2018) in Au-Ag nanostructures (updated by Thapaet al., 2019). Sharpening our theory, we suggest that \textit{Coulombrepulsions in certain structurally perturbed regions (atomic clusters, stackingfaults, grain boundaries etc.) create nanoscale reservoirs of singlet electronpairs}. These low dimensional patches are hybridized to a background 3D jelliummetal and produce observed ambient Tc granular superconductivity via proximityJosephson effect. Using repulsive Hubbard model we show presence of singletreservoirs and physics of doped Mott insulators. Needed charge transfer arisesfrom differing electronegativities. Our theory predicts that \textit{allelemental monovalent (alkali, Cu, Ag and Au) metals, under suitable structuralperturbations, are likely to exhibit ambient temperature superconductivity}.

Singlet Reservoir Theory of Ambient Tc Granular Superconductivity in Monovalent Metal Nanostructures