Xenes are two-dimensional monoelemental materials beyond graphene. Many of them are of interest because of their electronic properties. Their mechanical properties are surveyed in the present book, with the contents being limited to the pure element, apart from occasionally considering the involvement of hydrogen which turns the 'ene into an ane'. The book references 156 original resources with their direct web links for in-depth reading. Keywords: Xenes, Graphene, Silicene, Germanene, Stanene, Tinene, Antimonene, Indiene, Arsenene, Phosphorene, Bismuthene, Borophene, Plumbene.