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francium
This term refers to a specific chemical element characterized by extreme instability and rarity. It is used almost exclusively in scientific, chemical, and radiological contexts, carrying a clinical and technical connotation rather than a general descriptive one.
As a mass noun representing a chemical element, it is uncountable. It does not have a plural form in standard usage; to refer to specific quantities, one must use partitive constructions such as "samples of francium" or "atoms of francium."
Meanings
Examples
Francium is the rarest of all naturally occurring elements.
Because it is so unstable, francium decays very quickly.
I wonder if anyone has ever seen a visible piece of francium.
Francium belongs to the alkali metal group on the periodic table.
The high radioactivity of francium makes it dangerous to handle.
Scientists can only produce tiny amounts of francium in a lab.