1) Atomic number 89 2) Chemical element 3) Chemical element 4) Element 5) Element discovered in 1899 6) Element found in uranium ore 7) Element number 89 8) Element with the symbol Ac 9) Found in uranium ores
Found on
https://www.crosswordclues.com/clue/actinium
Actinium is a radioactive chemical element with symbol Ac (not to be confused with the abbreviation for an acetyl group) 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 ga...
Found on
http://en.wikipedia.org/wiki/Actinium
• (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.
Found on
http://thinkexist.com/dictionary/meaning/actinium/
(Ac), radioactive chemical element, in Group IIIb of the periodic table, atomic number 89. Actinium was discovered (1899) by André-Louis Debierne in ... [1 related articles]
Found on
http://www.britannica.com/eb/a-z/a/14
(Ac) (ak-tin´e-әm) a highly radioactive chemical element, atomic number 89, atomic weight 227. It is used in radiotherapy.
Found on
http://www.encyclo.co.uk/local/21001
Ac·tin'i·um noun [ Greek ..., ..., ray.]
(Chemistry) 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.
Found on
http://www.encyclo.co.uk/webster/A/23
(Ac) Type: Term Pronunciation: ak-tin′ē-ŭm Definitions: 1. An element, atomic no. 89, atomic wt. 227.05; it possesses no stable isotopes and exists in nature only as a disintegration product of uranium and thorium.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=907
Actinium is a radioactive trivalent element that resembles lanthanum in chemical properties and is found especially in pitchblende. It has the symbol Ac.
Found on
http://www.probertencyclopaedia.com/browse/HA.HTM
[
n] - a radioactive element of the actinide series
Found on
http://www.webdictionary.co.uk/definition.php?query=actinium
A radioactive element. The name derives from the Greek, aktis or akinis for 'beam or ray' because it is a powerful source of alpha radiation. Symbol AcDiscoveredDiscovered by the French chemist Andre-Louis Debierne in 1899 and independently discovered by German chemist Friedrich Oskar Giesel in 1902, who called it emanium.
Found on
https://www.encyclo.co.uk/local/20687
Ac noun a radioactive element of the actinide series; found in uranium ores
Found on
https://www.encyclo.co.uk/local/20974
White, radioactive, metallic element, the first of the actinide series, atomic number 89, relative atomic mass 227; it is a weak emitter of high-energy alpha particles. Actinium occurs with uranium and radium in pitchblende and other ores, and can be synthesized by bombarding radium with neutrons. The longest-lived isotope, Ac-227, ...
Found on
https://www.encyclo.co.uk/local/21221
a radioactive silver-white metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence. Symbol: Ac; at. no.: 89; at. wt.: 227.
Found on
https://www.infoplease.com/dictionary/actinium
No exact match found.
