Spectroscopic properties of group-1 M 2 and MAu (M=K, Rb, Cs, Fr, and element 119) were calculated using the 4c-DFT method. The results show that the relativistic contraction and stabilization of the ns(M) AO result in the inversion of trends both in atomic and molecular properties in group 1 beyond Cs. Electronegativity χ of the elements proves to decrease from Cs, the most electropositive element of all elements, to element 119, with its χ value approaching that of Na. Due to the largest relativistic effects on the 8s(119) AO in group 1, bonding in (119) 2 appears to be stronger than that of K 2 , while bonding in 119Au should be the weakest out of all group-1 MAu. Using calculated dissociation energies of M 2 , sublimation enthalpies, ΔH sub , of Fr of 77kJ/mol and element 119 of 94kJ/mol were estimated using a linear correlation between these quantities in the chemical group. Using the M–Au binding energies, the adsorption enthalpies, −ΔH ads , of 106kJ/mol on gold, 76kJ/mol on platinum, and 63kJ/mol on silver were estimated for element 119 via a correlation with known ΔH ads in the chemical group. These moderate ΔH ads values are indicative of a possibility of chromatography adsorption studies of element 119 on the noble metal surfaces.