Noun Actinium Definition and Examples


Noun:

Actinium

Pronunciation:

/akˈtɪnɪəm/

Definition:
1.

noun

The chemical element of atomic number 89, a radioactive metallic element of the actinide series. It is rare in nature, occurring as an impurity in uranium ores.
  1. 'Along the way, these disintegration series produce radioactive isotopes of protactinium, thorium, actinium, radium, francium, radon, astatine, polonium, bismuth, lead, thallium and mercury.'
  2. 'A proposal was patented for a ceramic block pessary using radioactive elements such as thorium, actinium and even radium.'
((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.)


Origin:
Early 20th century: from Greek aktis, aktin- ‘ray’ + -ium.

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