Science Fair Project Encyclopedia
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 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.
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details