What is actinium?

  • (noun): A radioactive element of the actinide series; found in uranium ores.
    Synonyms: Ac, atomic number 89

Actinium

Actinium is a radioactive chemical element with symbol Ac (not to be confused with the abbreviation for an acetyl group) and has the atomic number 89, which was discovered in 1899. It was the first non-primordial radioactive element to be isolated. Polonium, radium and radon were observed before actinium, but they were not isolated until 1902. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table.

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Some articles on actinium:

Actinide
... chemical elements with atomic numbers from 89 to 103, actinium through lawrencium ... derives its name from the group 3 element actinium ... The radioactive decay of uranium produces transient amounts of actinium and protactinium, and atoms of neptunium, americium, curium, berkelium and californium are occasionally produced from transmutation reactions in ...
Actinium - Precautions
... When actinium trichloride is administered intravenously to rats, about 33% of actinium is deposited into the bones and 50% into the liver ...
Period 7 Element - Actinides
... chemical elements with atomic numbers from 89 to 103, actinium through lawrencium ... The actinide series derives its name from the group 3 element actinium ... The radioactive decay of uranium produces transient amounts of actinium and protactinium, and atoms of neptunium, americium, curium, berkelium and ...
Radium Series - Actinide Alpha Decay Chains - Actinium Series
... isotope U-235, this decay series includes the following elements Actinium, astatine, bismuth, francium, lead, polonium, protactinium, radium, radon, thallium, and thorium. 25.52 h 0.391 231Pa 231Pa Protactinium α 32760 a 5.150 227Ac 227Ac Ac Actinium β− 98.62% α 1.38% 21.772 a 0.045 5.042 227Th 223Fr 227Th RdAc ...
Isotope Lists, 73-96 - Actinium
... Main article Isotopes of actinium Isotope Half-life Spin Parity Mode(s) or Abundance 206Ac 22 ms (3+ ) %α=? 206m1Ac 33 ms (10- ) 207Ac 22 ms (9/2- ) %α ~ 100 208Ac 95 ms (3+ ) %α=? 208m1Ac 25 ms (10- ) %α=? 209Ac 0 ...