Definitions
a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
Word origin
From French francium, from France + -ium (after the native country of Marguerite Perey).
Used in a sentence
“The most elusive element of all, however, appears to be francium, which is so rare that it is thought that our entire planet may contain, at any given moment, fewer than twenty francium atoms.”
“Notice that franciums are balanced without even thinking in moles, atoms, or whatever.”
“(a) Radons and poloniums are compared, (b) poloniums and astatines are compared and (c) radons and franciums are compared.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“radioactive alkali metal”8 letters
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