actinium /ac·tin·i·um/ (Ac) (ak-tin´e-um) a chemical element, at. no. 89.
actinium (Ac),
ac·tin·i·um ( k-t n  - m)n. Symbol Ac A radioactive element found in uranium ores. Its longest lived isotope is Ac 227 with a half-life of 21.6 years. Atomic number 89. |
actinium (Ac),
a rare, radioactive metallic element. Its atomic number is 89; its atomic mass is 227. It occurs in some ores of uranium.
actinium
a chemical element, atomic number 89, atomic weight 227, symbol Ac. See Table 6.
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