英和和英

語源

From French francium, from France +‎ -ium (after the native country of Marguerite Perey).

発音

• (英国発音) IPA: /ˈfɹansɪəm/, /ˈfɹɑːnsɪəm/
• (米国発音) enPR: frăn'sēəm, IPA: /ˈfɹænsi.əm/

名詞

francium (usually uncountable, plural franciums)

1. The chemical element (symbol Fr) with an atomic number of 87. It is an intensely radioactive alkali metal that is not found in nature.
   • 2003, Bill Bryson, A Short History of Nearly Everything, BCA, page 221:

     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.

2. (countable) A single atom of this element.
   • 1999, Peter J. Krieger, Understanding Chemical Principles: A Learning Companion, page 56:

     Notice that franciums are balanced without even thinking in moles, atoms, or whatever.

   • 2007, Carl J. Gross, Witold Nazarewicz, Krzysztof P. Rykaczewski, The 4th International Conference on Exotic Nuclei and Atomic Masses, page 180:

     (a) Radons and poloniums are compared, (b) poloniums and astatines are compared and (c) radons and franciums are compared.

同意語

• actinium-K (obsolete)
• virginium (obsolete)

派生語

• eka-francium
• franciumlike

参照

• Francium on the British Royal Society of Chemistry's online periodic table

発音

• (Classical Latin) IPA: [ˈfraŋ.ki.ũː]
• (modern Italianate Ecclesiastical) IPA: [ˈfran̠ʲ.t͡ʃi.um]

名詞

francium n (genitive franciī); second declension

1. francium

語形変化

Second-declension noun (neuter).