Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
Mercury hydride (HgH) is a binary compound of hydrogen and mercury. The Hg-H bond is very weak and therefore the compound has only been detected in matrix isolation at temperatures up to 6 K. The dihydride HgH2 and the linear dimer HHgHgH have also been detected this way.
References
Hydrides of the Main-Group Metals: New Variations on an Old Theme Simon Aldridge , Anthony J. Downs Chem. Rev., 2001, 101 (11), pp 3305–3366 doi:10.1021/cr960151d
Hyperfine Interaction, Chemical Bonding, and Isotope Effect in ZnH, CdH, and HgH Molecules Lon B. Knight and William Weltner J. Chem. Phys. 55, 2061 (1971); doi:10.1063/1.1676373