Plural of francium, the plural form of the radioactive chemical element with atomic number 87.
Francium is named after France (Latin Francia), as it was discovered by French scientist Marguerite Perey in 1939. The plural '-iums' is the standard form for element names.
Francium is so radioactive that not even a thimbleful exists naturally on Earth at any moment—it's instantly transmuting, making it one of nature's rarest elements despite being named after an entire country.
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