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Lanthanide

The lanthanide series comprises the 15 elements from lanthanum to lutetium on the periodic table, with atomic numbers 57 through 71.

All lanthanides except lutetium are f-block elements, corresponding to the filling of the 4f electron shell.

The lanthanides are also sometimes referred to by the name "rare earths".

Note:   The above text is excerpted from the Wikipedia article "Lanthanide", which has been released under the GNU Free Documentation License.
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May 25, 2015

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