Jun 19, 2024 · yet despite their widespread use, researchers still know very little about the chemistry of promethium, a lanthanide with an atomic number of 61, which was first identified. Promethium is a chemical element with symbol pm and atomic number 61. All of its isotopes are radioactive; Scientists have uncovered the properties of a rare earth element that was first discovered 80 years ago at the very same laboratory, opening a new pathway for the exploration of elements.
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