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francium

n. 钫

钫

WordNet (r) 3.0 (2006) (WordNet)

francium
n 1: a radioactive element of the alkali-metal group discovered
as a disintegration product of actinium [synonym: {francium},
{Fr}, {atomic number 87}]

The Elements Database (element)

francium
Symbol: Fr
Atomic number: 87
Atomic weight: (223)
Radioactive element, belongs to group 1 of the periodic table. Found in
uranium and thorium ores. The 22 known isotopes are all radioactive,
with
the most stable being Fr-223. Its existence was confirmed in 1939 by
Marguerite Perey.

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francium	查看　francium　在百度字典中的解释	百度英翻中〔查看〕
francium	查看　francium　在Google字典中的解释	Google英翻中〔查看〕
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