Neodymium
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Neodymium is a chemical element; it has symbol Nd and atomic number 60. It is the fourth member of the lanthanide series and is considered to be one of the rare-earth metals. It is a hard, slightly ma
Neodymium metal in a glass vial
Neodymium(III) sulfate
Neodymium acetate powder
Neodymium(III) hydroxide powder
Promethium
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Promethium is a generally synthetic chemical element; it has symbol Pm and atomic number 61. All of its isotopes are radioactive; it is extremely rare, with only about 500–600 grams naturally occurrin
Neodymium
…fourth member of the lanthanide series. In the periodic table, it appears between the lanthanides praseodymium to its left and the radioactive element promethium to its right, and above the actinide uranium. Its 60 electrons are arranged in the configuration [Xe]4f46s2, of which the six 4f and 6s electrons are…
Promethium 147 solution
Promethium nitrate
Uraninite, a uranium ore and the host for most of Earth's promethium