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ErH2 is Fluorite structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Er is bonded in a body-centered cubic geometry to eight equivalent H atoms. All Er–H bond lengths are 2.22 Å. H is bonded to four equivalent Er atoms to form a mixture of edge and corner-sharing HEr4 tetrahedra.
ErH2 crystallizes in the hexagonal P6_3/mmc space group. The structure is three-dimensional. Er is bonded in a 8-coordinate geometry to eight equivalent H atoms. There are two shorter (2.17 Å) and six longer (2.27 Å) Er–H bond lengths. H is bonded to four equivalent Er atoms to form a mixture of edge, face, and corner-sharing HEr4 tetrahedra.