francium

名词 n.
中文释义
英 /ˈfɹansɪəm/|/ˈfɹɑːnsɪəm/    美 /ˈfɹænsi.əm/

英文释义

名词 n.
  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. uncountable,usually
    — 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. A single atom of this element. countable,usually
    — Notice that franciums are balanced without even thinking in moles, atoms, or whatever.

词形变化

franciums plural

词汇关系

近义词
actinium-K virginium
衍生词
eka-francium franciumlike

词源

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