actinium$912$ - определение. Что такое actinium$912$
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Что (кто) такое actinium$912$ - определение

WIKIMEDIA LIST ARTICLE
Actinium-206; Actinium-207; Actinium-208; Actinium-209; Actinium-210; Actinium-211; Actinium-212; Actinium-213; Actinium-214; Actinium-215; Actinium-216; Actinium-217; Actinium-218; Actinium-219; Actinium-220; Actinium-221; Actinium-222; Actinium-223; Actinium-224; Actinium-226; Actinium-227; Actinium-228; Actinium-229; Actinium-230; Actinium-231; Actinium-232; Actinium-233; Actinium-234; Actinium-235; Actinium-236; Actinium isotopes; Actinium isotope

Area code 912         
  • 350px
TELEPHONE AREA CODE FOR SOUTHEASTERN GEORGIA, UNITED STATES
912 area code; Savannah area codes
Area code 912 is a telephone area code in the North American Numbering Plan (NANP) for the southeastern part of the U.S.
912         
  • Alexander III]] (870–913)
YEAR
912 (year); Year 912; AD 912; 912 CE; 912 AD; Events in 912; Births in 912; Deaths in 912
Year 912 (CMXII) was a leap year starting on Wednesday (link will display the full calendar) of the Julian calendar.
Isotopes of actinium         
Actinium (89Ac) has no stable isotopes and no characteristic terrestrial isotopic composition, thus a standard atomic weight cannot be given. There are 32 known isotopes, from 205Ac to 236Ac, and 7 isomers.

Википедия

Isotopes of actinium

Actinium (89Ac) has no stable isotopes and no characteristic terrestrial isotopic composition, thus a standard atomic weight cannot be given. There are 33 known isotopes, from 204Ac to 236Ac, and 7 isomers. Three isotopes are found in nature, 225Ac, 227Ac and 228Ac, as intermediate decay products of, respectively, 237Np, 235U, and 232Th. 228Ac and 225Ac are extremely rare, so almost all natural actinium is 227Ac.

The most stable isotopes are 227Ac with a half-life of 21.772 years, 225Ac with a half-life of 10.0 days, and 226Ac with a half-life of 29.37 hours. All other isotopes have half-lives under 10 hours, and most under a minute. The shortest-lived known isotope is 217Ac with a half-life of 69 ns.

Purified 227Ac comes into equilibrium with its decay products (227Th and 223Fr) after 185 days.