Actinium


a radioactive silver-white metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence. symbol: ac; atomic number: 89; atomic weight: 227.
historical examples

other radio-active substances have each several derivatives: actinium has nine, uranium has four.
inventors at work george iles

actinium, an element or elementary substance obtained in minute quant-ties in connection with the study of radioactivity.
the new gresham encyclopedia. vol. 1 part 1 various

for if actinium was an independent element we would be sure to find actinium haloes.
the birth-time of the world and other scientific essays j. (john) joly

in 1902 giesel discovered another substance which he called emanium, and which was considered to be identical with actinium.
the new gresham encyclopedia. vol. 1 part 1 various

emanium was the name originally proposed by giesel for the body now known as actinium.
a brief account of radio-activity francis preston venable

m. debierne has obtained a third radioactive substance from pitchblende, which he has called “actinium.”
alchemy: ancient and modern h. stanley redgrove

the element has since been found in nature as a small const-tuent of the natural decay of actinium.
a brief history of element discovery, synthesis, and -n-lysis glen w. watson

these are generally known as radium emanation, thorium emanation, and actinium emanation.
a brief account of radio-activity francis preston venable

on rutherford’s theory then, actinium should always accompany uranium and radium, but in very subordinate amount.
the birth-time of the world and other scientific essays j. (john) joly

in this cl-ss are now placed also the three radio-active gases, emanating respectively from radium, thorium, and actinium.
a brief account of radio-activity francis preston venable

noun
a radioactive element of the actinide series, occurring as a decay product of uranium. it is used as an alpha-particle source and in neutron production. symbol: ac; atomic no: 89; half-life of most stable isotope,227ac: 21.6 years; relative density: 10.07; melting pt: 1051°c; boiling pt: 3200 ± 300°c
n.

radioactive element discovered in 1899, from greek actin-, comb. form of aktis (genitive aktinos) “ray, radiance” (see actino-) + chemical suffix -ium.

actinium ac·tin·i·um (āk-tĭn’ē-əm)
n.
symbol ac
a radioactive element found in uranium ores. its longest lived isotope is ac 227 with a half-life of 21.6years. atomic number 89; melting point 1,050°c; boiling point (estimated) 3,200°c; specific gravity (calculated) 10.07; valence 3.
actinium
(āk-tĭn’ē-əm)
symbol ac
a silvery-white, highly radioactive metallic element of the actinide series that is found in uranium ores. it is about 150 times more radioactive than radium and is used as a source of alpha rays and neutrons. its most stable isotope has a half-life of about 22 years. atomic number 89; melting point 1,050°c (1,922°f); boiling point (estimated) 3,200°c (5,792°f); specific gravity (calculated) 10.07; valence 3. see periodic table.

Read Also:

  • Actinium emanation

    . a chemically inert, gaseous, short-lived isotope of radon that is a member of the . symbol: an; atomic number: 86; atomic weight: 219. historical examples these are generally known as radium emanation, thorium emanation, and actinium emanation. a brief account of radio-activity francis preston venable noun a radioisotope of radon that is a decay […]

  • Actinium series

    the radioactive series that starts with uranium 235 and ends with a stable isotope of lead of m-ss number 207. noun a radioactive decay series that starts with uranium-235 and ends with lead-207

  • Actino-

    a combining form with the meaning “ray, beam,” used in the formation of compound words, with the particular senses “radiation” in the physical sciences (actinometer) and “having raylike structures,” “radiate in form” in biology (actinomyces; actinopod). combining form indicating a radial structure: actinomorphic indicating radioactivity or radiation: actinometer before vowels actin-, word-forming element meaning “pertaining […]

  • Actinobacillus

    any of several spherical or rod-shaped, aerobic, parasitic bacteria of the genus actin-bacillus, certain species of which, as a. mallei, are pathogenic for animals.

  • Actinobacillosis

    an infectious disease of cattle, domestic animals, and occasionally humans, resembling actinomycosis and caused by the bacterium actin-bacillus lignieresii. noun (vet science) a disease of cattle and sheep, caused by infection with an actin-bacillus lignieresii and characterized by soft tissue lesions, esp of the tongue also called wooden tongue, woody tongue, cruels


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