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
Promethium 147 solution
Promethium nitrate
Uraninite, a uranium ore and the host for most of Earth's promethium
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
Promethium
…state of +3. In 1902 Bohuslav Brauner suggested that there was a then-unknown element with properties intermediate between those of the known elements neodymium (60) and samarium (62); this was confirmed in 1914 by Henry Moseley, who, having measured the atomic numbers of all the elements then known, found that…
Neodymium metal in a glass vial
Neodymium(III) sulfate
Neodymium acetate powder
Neodymium(III) hydroxide powder