CAS Number7440-15-5
PubChem CID23947
Atomic Radius137
Atomic Volume8.85
Atomic Weight186.207
Boiling Point5,596
Bulk Modulus
CategoryTransition metals
Crystal StructureSimple Hexagonal
Covalent Radius151
Electrical Resistivity
Electron Configuration[Xe] 4f14 5d5 6s2
Electrons per shell2, 8, 18, 32, 13, 2
Heat of Fusion33
Heat of Vaporization705
Ionization Potential7.834
Magnetic Ordering
Magnetic Susceptibility
Mass Number75
Melting Point3,186
Atomic Number186
Oxidation States-3, -1, 1, 2, 3, 4, 5, 6, 7
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.137
Thermal Conductivity0.479
Van der Waals radius
Young's Modulus
Abundance in Earth's crust2.6×10-7%
Abundance in Universe2×10-8%
Re Rhenium 75 186.207 7 6 d 75 3180.0 5600.0 [Xe] 4f14 5d5 6s2 2 8 18 32 13 2 21.0 2.6E-7% Gray Hexagonal 1.9 1.60 {"1":"760","2":"1260","3":"2510","4":"3640"} 760 14.5 +7,4,6 1.37 8.85 33.05 707.1 0.137 47.9 0 Solid, Conductor, TransitionMetal, Metal, Stable, Natural REE-ni-em Rare and costly, dense, silvery-white metal. Mixed with tungsten or platinum to make filaments for mass spectrographs. Its main value is as a trace alloying agent for hardening metal components that are subjected to continuous frictional forces. Found in small amounts in gadolinite and molybdenite. Has a very high melting point. uTm_wWAEz1Q Rhenium
Neodymium was first identified in 1885, in Vienna, by the Austrian chemist Carl Auer von Welsbach.

It was discovered in didymium, a substance incorrectly said by Carl Gustav Mosander to be a new element in 1841.

Pure neodymium metal was isolated in 1925. From the Greek word neos meaning new, and didymos, twin 75 1925 Walter Noddack, Ida Tacke, Otto Berg Germany From the Greek word "Rhenus" meaning river "Rhine"

Isotopes of Neodymium

Standard Atomic Weight


Stable Isotopes

185Re 187Re

Unstable Isotopes

160Re 161Re 162Re 163Re 164Re 165Re 166Re 167Re 168Re 169Re 170Re 171Re 172Re 173Re 174Re 175Re 176Re 177Re 178Re 179Re 180Re 181Re 182Re 183Re 184Re 186Re 188Re 189Re 190Re 191Re 192Re 193Re 194Re

Neodymium is considered to be moderately toxic
Most of the world's neodymium is mined in China
Neodymium is used to make specialized goggles for glass blowers.

Neodymium magnets appear in products such as microphones, professional loudspeakers, in-ear headphones, guitar and bass guitar pick-ups and computer hard disks.

Glass containing neodymium can be used as a laser material to produce coherent light.