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Encyclopedia > Actinides
Atomic No. Name Symbol
89 Actinium Ac
90 Thorium Th
91 Protactinium Pa
92 Uranium U
93 Neptunium Np
94 Plutonium Pu
95 Americium Am
96 Curium Cm
97 Berkelium Bk
98 Californium Cf
99 Einsteinium Es
100 Fermium Fm
101 Mendelevium Md
102 Nobelium No


The actinide series encompasses the 14 chemical elements that lie between actinium and nobelium on the periodic table with atomic numbers 89 - 102 inclusive. They are similar in characteristics to the elements of the lanthanide series. The actinides with the higher atomic numbers are not found in nature and have short half-lives.


The actinides are typically placed below the main body of the periodic table, in the manner of a footnote. The full-width version of the periodic table shows the position of the actinides more clearly.






  Results from FactBites:
 
actinide series. The Columbia Encyclopedia, Sixth Edition. 2001-05 (323 words)
It is known, however, that all members of the series resemble actinium and each other in their chemical properties and that they have a strong chemical resemblance to their homologs in the lanthanide series.
The actinides are reactive and assume a number of different valences in their compounds.
Elements with atomic numbers greater than 103 are not members of the actinide series; element 104 (rutherfordium) is the first of the transactinide elements.
Actinide Summary (779 words)
Other isotopes of the actinide elements that have found application are Pu-238 which is used to power heart pacemakers and space instrumentation, americium-241 which is used in smoke detectors, and californium-252 which is used in analytical techniques that involve production of isotopes of other elements by neutron-capture.
The actinide series encompasses the 15 chemical elements that lie between actinium and lawrencium on the periodic table with atomic numbers 89 - 103.
The actinides display less similarity in their chemical properties than the lanthanide series, for instance exhibiting a wider range of oxidation states, which initially led to confusion as to whether actinium, thorium and uranium should be considered d-block elements.
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