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单词 californium
释义
cal·i·for·ni·um (kălə-fôrnē-əm)
n. Symbol Cf
A synthetic transuranic element having isotopes with mass numbers from 237 to 256 and half-lives varying from 21 milliseconds to 898 years. All isotopes are radioactive, chiefly by emission of alpha particles, and Cf-252 is a potent neutron emitter. Atomic number 98; melting point 900°C; specific gravity 15.1; valence 3. See Periodic Table.

[After California.]
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更新时间:2025/3/22 10:46:00