actinium


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actinium

 (Ac) [ak-tin´e-um]
a chemical element, atomic number 89, atomic weight 227. (See Appendix 6.)

ac·tin·i·um (Ac),

(ak-tin'ē-ŭm),
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.
[G. aktis, a ray]

ac·tin·i·um

(Ac) (ak-tin'ē-ŭm)
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.
[G. aktis, a ray]
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Actinium was the key element in giving the modern periodic table its shape, since Seaborg and his colleagues decided to cleave all the heavy elements known at the time--now called the actinides, after their first brother--and cordon them off at the bottom of the table.
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The second group would be the fifteen elements running from actinium (number 89) to element number 103 inclusive, and they were named the actinides.
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