Reference Terms
from Wikipedia, the free encyclopedia


The actinide series encompasses the 15 chemical elements that lie between actinium and lawrencium on the periodic table with atomic numbers 89 - 103.

The actinide series is named after actinium.

All actinides are f-block elements except lawrencium.

Note:   The above text is excerpted from the Wikipedia article "Actinide", which has been released under the GNU Free Documentation License.
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September 25, 2016

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updated 12:56 pm ET