Superconductor: without transition temperature
Elements have no (known) transition temperature. Examples are hydrogen and other elements of the 1st main group, all noble gases as well as many elements of the lanthanides and actinides.
2HeHeliumcolorless gas, exhibiting a gray, cloudy glow 9FFluorinevery pale yellow (gas); bright yellow (liquid); alpha is opaque, beta is transparent (solid) 10NeNeoncolorless gas exhibiting an orange-red glow when placed in an electric field 18ArArgoncolorless gas exhibiting a lilac/violet glow when placed in an electric field 19KPotassiumsilvery white, faint bluish-purple hue when exposed to air 28NiNickellustrous, metallic, and silver with a gold tinge 36KrKryptoncolorless gas, exhibiting a whitish glow in an electric field 54XeXenoncolorless gas, exhibiting a blue glow when placed in an electric field 63EuEuropiumsilvery white, with a pale yellow tint; but rarely seen without oxide discoloration 89AcActiniumsilvery-white, glowing with an eerie blue light; sometimes with a golden cast 96CmCuriumsilvery metallic, glows purple in the dark