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单词 francium
释义 fran·ci·um
\ˈfran(t)sēəm\ noun
(-s)
Etymology: New Latin, from France + New Latin -ium
: a radioactive element of the alkali-metal group discovered as a disintegration product of actinium and obtained artificially by the bombardment of thorium with protons — symbol Fr; see actinium series, element table
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