actinium (Ac)
Biology

actinium (Ac)



Term: actinium (Ac)
Literally meaning: ?pertaining to ray?
Origin:
???? actis(genitive á?????/actinos)(=ray, beam)

The element was named after its power of emitting energy in the form of rays suchas radioactive ?radium? which comes from latin radius=ray.
Coined/History

Actinium was found in 1899 by French chemist Andre-Louis  Dabierne (1874-1949) and by German chemist Friedrich Oskar Giesel (1852-1927) in 1902 independently.  Giesel named it ?emanium? but finally it was chosen Dabierne name because of its seniority. Dabierne who worked with Marie Curie discovered actinium in an uranium ore from which radium and polonium had been isolated.

Definition
Actinium is a soft silvery-white and highly radioactive chemical element with atomic number 89 and atomic mass 229.  Actinium has 29 radioactive isotopes and glows in the dark. Because of its high radioactivity the lelement is used as neutron sourse.
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- Plutonium (pu)
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Term: uranium (U)Literally meaning: ?pertaining to planet Uranus ?Origin?'õ???ü?/uranos(=heaven, sky)???/ano (=above)+????/oros(=mountain)The name was given after the recently dicovered planet Uranus.  The planet name was given by German astronomer...

- Astatine (at)
Term: astatine (At)Literally meaning: ?pertaining to  unstable?Origin'á/(privative, ?non?) ???????/istamai(=stand)The element named after observation that there are no stable astatine isotopes as the longest lived isotope (astatine-210) has...

- Lanthanum (la)
Term: lanthanum (La)Literally meaning: ?pertaining to hidden?Origin: ???????/lanthano(= to be hidden, to escape notice) .The element called lanthanum because it is ?hidden? in rare minerals. Coined/History  Lanthanum was isolated in the mineral...

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Term: technetium (?c)Literally meaning: ?pertaining to artificial?Origin: Anc Greek????????/technetos(=hand made, artificial) > ????? (verb)/ticto (=give birth, produce) Coined/History  Technetium?s existence was predicted by Dmitri...



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