Definition of Actinium

1. Noun. A radioactive element of the actinide series; found in uranium ores.

Exact synonyms: Ac, Atomic Number 89
Generic synonyms: Chemical Element, Element
Substance meronyms: Uranium Ore



Definition of Actinium

1. n. 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.

Definition of Actinium

1. Noun. a radioactive, metallic chemical element (''symbol'': Ac) with an atomic number of 89; found in uranium ores ¹

¹ Source: wiktionary.com

Definition of Actinium

1. a radioactive element [n -S]

Medical Definition of Actinium

1. 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. Origin: Gr, ray. Source: Websters Dictionary (01 Mar 1998)

Actinium Pictures

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Lexicographical Neighbors of Actinium

actinically
actinide
actinide elements
actinide series
actinides
actinidic
actinidic acid
actinidin
actinidine
actiniferous
actiniform
actinin
actinins
actinism
actinisms
actinium (current term)
actiniums
actino-
actino-chemistry
actino-uranium
actinobacillosis
actinobacillus actinomycetemcomitans
actinobacillus infections
actinobacillus pleuropneumoniae
actinobacteria
actinobacteria group
actinobacterial
actinobacterium
actinobiology

Literary usage of Actinium

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Dictionary of Applied Chemistry by Thomas Edward Thorpe (1921)
"actinium salts also evolve an emanation, an inert gas having a molecular weight of approximately 230 (218 or 222 ?), according to diffusion experimente (De- ..."

2. The Chemistry of the Radio-elements by Frederick Soddy (1914)
"THE ORIGIN OF actinium ALTHOUGH the long outstanding problem of the origin of actinium ... There is little doubt that actinium is a relatively short-lived ..."

3. Radioactive substances and their radiations by Ernest Rutherford (1913)
"Consequently, if actinium B and D are vola- lised by strong heating of the preparation of actinium X, the y activity, as shown by Godlewski, ..."

4. The Electrical Nature of Matter and Radioactivity by Harry Clary Jones (1906)
"The problem of the origin of the emanation in actinium was then attacked. It will be remembered that the thorium emanation comes from thorium X. Does the ..."

5. Radioactive Transformations by , Ernest Rutherford (1906)
"This result shows that actinium B, which emits rays, must have the shorter period. The analogy with thorium became still closer when God- ..."

6. Recent Advances in Physical and Inorganic Chemistry by Alfred Walter Stewart (1909)
"actinium Recurring to the table on p. 209, it will be noticed that the substance actinium is precipitated along with metals of the iron group. ..."

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