Actinide

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 between 89 and 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.


ca:Actínid de:Actinoide es:Actínido eo:Aktinoido fr:Actinide it:Attinidi nl:Actinide ja:アクチノイド

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