Definitions for Actinium
ækˈtɪn i əmac·tini·um

Princeton's WordNetRate this definition:0.0 / 0 votes

1. actinium, Ac, atomic number 89noun

   a radioactive element of the actinide series; found in uranium ores

WiktionaryRate this definition:0.0 / 0 votes

1. actiniumnoun

   a radioactive, metallic chemical element (symbol: Ac) with an atomic number of 89; found in uranium ores

WikipediaRate this definition:0.0 / 0 votes

1. Actinium

   Actinium is a chemical element with the symbol Ac and atomic number 89. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name emanium; the element got its name by being wrongly identified with a substance André-Louis Debierne found in 1899 and called actinium. Actinium gave the name to the actinide series, a set of 15 elements between actinium and lawrencium in the periodic table. Together with polonium, radium, and radon, actinium was one of the first non-primordial radioactive elements to be isolated. A soft, silvery-white radioactive metal, actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that prevents further oxidation. As with most lanthanides and many actinides, actinium assumes oxidation state +3 in nearly all its chemical compounds. Actinium is found only in traces in uranium and thorium ores as the isotope 227Ac, which decays with a half-life of 21.772 years, predominantly emitting beta and sometimes alpha particles, and 228Ac, which is beta active with a half-life of 6.15 hours. One tonne of natural uranium in ore contains about 0.2 milligrams of actinium-227, and one tonne of thorium contains about 5 nanograms of actinium-228. The close similarity of physical and chemical properties of actinium and lanthanum makes separation of actinium from the ore impractical. Instead, the element is prepared, in milligram amounts, by the neutron irradiation of 226Ra in a nuclear reactor. Owing to its scarcity, high price and radioactivity, actinium has no significant industrial use. Its current applications include a neutron source and an agent for radiation therapy.

ChatGPTRate this definition:0.0 / 0 votes

1. actinium

   Actinium is a radioactive chemical element with the symbol Ac and atomic number 89. It is part of the group of actinide elements. Actinium is found naturally in trace amounts within uranium and thorium ores. It is more radioactive than plutonium or radium and glows blue in the dark. With a half-life of 320 years, its most stable isotope is Actinium-227. It has no significant commercial applications and is mostly used in scientific research.

Webster DictionaryRate this definition:0.0 / 0 votes

1. Actiniumnoun

   a supposed metal, said by Phipson to be contained in commercial zinc; -- so called because certain of its compounds are darkened by exposure to light

2. Etymology: [Gr. , , ray.]

WikidataRate this definition:0.0 / 0 votes

1. Actinium

   Actinium is a radioactive chemical element with symbol Ac and 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. A soft, silvery-white radioactive metal, actinium reacts rapidly with oxygen and moisture in air forming a white coating of actinium oxide that prevents further oxidation. As with most lanthanides and actinides, actinium assumes oxidation state +3 in nearly all its chemical compounds. Actinium is found only in traces in uranium ores as the isotope 227Ac, which decays with a half-life of 21.772 years, predominantly emitting beta particles. One tonne of uranium ore contains about 0.2 milligrams of actinium. The close similarity of physical and chemical properties of actinium and lanthanum makes separation of actinium from the ore impractical. Instead, the element is prepared, in milligram amounts, by the neutron irradiation of 226Ra in a nuclear reactor. Owing to its scarcity, high price and radioactivity, actinium has no significant industrial use. Its current applications include a neutron source and an agent for radiation therapy targeting cancer cells in the body.

U.S. National Library of MedicineRate this definition:0.0 / 0 votes

1. Actinium

   Actinium. A trivalent radioactive element and the prototypical member of the actinide family. It has the atomic symbol Ac, atomic number 89, and atomic weight 227.0278. Its principal isotope is 227 and decays primarily by beta-emission.

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1. • Element

How to pronounce Actinium?

1. Alex

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Numerology

1. Chaldean Numerology

   The numerical value of Actinium in Chaldean Numerology is: 7

2. Pythagorean Numerology

   The numerical value of Actinium in Pythagorean Numerology is: 9

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References

1. ^ Princeton's WordNet
   http://wordnetweb.princeton.edu/perl/webwn?s=Actinium
2. ^ Wiktionary
   https://en.wiktionary.org/wiki/Actinium
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Actinium
4. ^ ChatGPT
   https://chat.openai.com
5. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/Actinium
6. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=Actinium