chemical-element

Narrow by material 133 metal 118 radioactive-material 22 iron 20 carbon 12 atom 8 isotope 8 radioisotope 7 alloy 6 noble-gas 6 nonmetal 6 cast-iron 4 electrical-conductor 4 gold 4 lead 4 pig-iron 4 chemical 3 alloy-iron 2 compound 2 fluid 2 fullerene 2 iodine 2 liquid 2 plutonium 2 uranium 2 antimonial-lead 1 calcium 1 cesium 1 char 1 chlorine 1 cobalt 1 copper 1 fuel 1 graphite 1 hydrogen 1 mineral 1 nitrogen 1 oxygen 1 plutonium-239 1 silver 1