Promethium Entou

Element 61, the only lanthanide with no stable isotopes. All isotopes are radioactive, existing on Earth only in trace amounts from nuclear fission products and spontaneous fission in uranium ores. Named after Prometheus, the Titan who stole fire from the gods to give to humanity. Pm-147 (half-life 2.62 years) beta rays excite phosphors to illuminate darkness, power atomic batteries for space exploration, and measure thickness for industrial quality. An idealist who burns through limited time precisely because he has no stability.