lanthanide
Noun
Meaning
any element of the lanthanide series (atomic numbers 57 through 71)
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Examples
As there are seven 4f orbitals, the number of unpaired electrons can be as high as 7, which gives rise to the large magnetic moments observed for lanthanide compounds.
Click here for more information. main infobox Thulium is a chemical element with symbol Tm and atomic number 69. It is the thirteenth and antepenultimate (third-last) element in the lanthanide series.
Also, a common presentation is to put all 15 lanthanide and actinide columns below, while the f-block only has 14 columns.
Consequently, the lanthanide elements with incompletely filled 4f-orbitals are paramagnetic or magnetically ordered.
Consequently, the spectra of lanthanide ions are rather weak and the absorption bands are similarly narrow.
However, there is one notable exception, known as the lanthanide contraction : the 5d block of elements are much smaller than one would expect, due to the shielding caused by the 4f electrons.