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/ˈfɹansɪəm/ · noun
The chemical element (symbol Fr) with an atomic number of 87. It is an intensely radioactive alkali metal that is not found in nature..
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.
Use francium when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Francium means The chemical element (symbol Fr) with an atomic number of 87. It is an intensely radioactive alkali metal that is not found in nature..
Common synonyms include actinium-K, virginium, fr, atomic number 87.
The opposite depends on the specific sense.
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.
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