Pm Promethium 61 (145) 6 f 61 1042.0 3000.0 [Xe] 4f5 6s2 2 8 18 23 8 2 7.26 None Silver Hexagonal {"1":"540","2":"1050","3":"2150","4":"3970"} 540 50 3 22.4 17.9 1 17.73 y 25.56y ElectronCapture Solid, Conductor, Lanthanide, Radioactive, Synthetic pro-MEE-thi-em Rare earth metal of synthetic origin on the earth, naturally made in stars. It has been used as a source of radioactivity for thickness-measuring gages. Does not occur naturally. Found among fission products of uranium, thorium, and plutonium. px52fxITTrw Promethium

Cadmium was discovered by German chemist Friedrich Stromeyer in 1817 as an impurity in zinc carbonate.

Stromeyer noted that some impure samples of calamine (zinc carbonate) changed color when heated but pure calamine did not.

Cadmium was independently discovered by German chemist Karl Hermann in 1818. From the Latin word cadmia, Greek kadmeia - the ancient name for calamine, zinc carbonate 61 1945 J. A. Marinsky, Lawrence Glendenin, Charles D. Coryell United States Named after "Prometheus" in Greek mythology, who stole fire from the gods

Cadmium and its compounds are highly toxic

Cadmium is a soft metal which is easily cut with a knife

Cadmium is a key component in battery production.

It is also is used in electroplating.

Cadmium oxide is used in black and white television phosphors and in the blue and green phosphors for color television picture tubes.

Cadmium is used as a barrier to control neutrons in nuclear fission.