Atomic Number:	61
Atomic Symbol:	Pm
Atomic Weight:	145
Electron Configuration:	[Xe]6s24f5

Lanthanides, or rare earth metals, comprise a series of 15 metals starting with Lanthanum (atomic number 57) and ending with Lutetium (atomic number 71). Lanthanides have been used extensively in industry, ophthalmic and camera lenses, petroleum cracking, nuclear reactors, television tubes, and mirrors, to mention a few applications. Some lanthanides were used in the treatment of tuberculosis, as anticoagulant agents, and as antinausea agents, and their potential uses in other areas of medicine are being explored, including inflammation, arthritis, tumor scanning, diagnosis of bone disease, and atherosclerosis. Symptoms of acute lanthanide intoxication include defecation, writhing, ataxia, sedation, and labored respiration.