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Lanthanides (rare earth metals) definition

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The fourteen elements of the upper row on the inner-transition metals on the periodic table that follow the element lanthanum (#57). Some reference sources include lanthanum in this series others do not. For all of these elements the filling orbital is 4f. This series is a sub-series of the transition metals .

See also:

Kinetic-molecular Theory definition
Lanthanides (rare earth metals) definition
latex sphere equivalent (LSE) definition
Lambertian radiator definition
Kjeldahl method definition