actinium /ac·tin·i·um/ (Ac) (ak-tin´e-um) a chemical element, at. no. 89.
actinium (Ac),
actinium (Ac) [ak-tin´e-um]
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 (Ac) [ak-tin´e-um]
a chemical element, atomic number 89, atomic weight 227. (See Appendix 6.)
actinium
a chemical element, atomic number 89, atomic weight 227, symbol Ac. See Table 6.
Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content.
| ?Page tools | ||
|---|---|---|
|