Neodymium

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Next Element: Promethium
60

Nd

144.24
Physical Properties
Color silvery-white
Phase at Room Temp. solid
Density (g/cm3) 7.003
Hardness (Mohs) ---
Melting Point (K) 1283.2
Boiling Point (K) 3300
Heat of Fusion (kJ/mol) 7.1
Heat of Vaporization (kJ/mol) 289
Heat of Atomization (kJ/mol) 328
Thermal Conductivity (J/m sec K) 16.5
Electrical Conductivity (1/mohm cm) 15.4
Source Monazite (phosphate), bastnaesite
Atomic Properties
Electron Configuration [Xe]6s24f4
Number of Isotopes 41 (7 natural)
Electron Affinity (kJ/mol) 50
First Ionization Energy (kJ/mol) 529.6
Second Ionization Energy (kJ/mol) 1035
Third Ionization Energy (kJ/mol) 2130
Electronegativity 1.14
Polarizability (Å3) 31.4
Atomic Weight 144.24
Atomic Volume (cm3/mol) 20.6
Ionic Radius2- (pm) ---
Ionic Radius1- (pm) ---
Atomic Radius (pm) 181
Ionic Radius1+ (pm) ---
Ionic Radius2+ (pm) ---
Ionic Radius3+ (pm) 112.3
Common Oxidation Numbers +3
Other Oxid. Numbers +2
Abundance
In Earth's Crust (mg/kg) 4.15x101
In Earth's Ocean (mg/L) 2.8x10-6
In Human Body (%) ---
Regulatory / Health
CAS Number 7440-00-8
OSHA Permissible Exposure Limit (PEL) No limits
OSHA PEL Vacated 1989 No limits
NIOSH Recommended Exposure Limit (REL) No limits
Sources:
University of Wisconsin General Chemistry
Mineral Information Institute
Jefferson Accelerator Laboratory
EnvironmentalChemistry.com
 
Glossary

Citation

(2006). Neodymium. Retrieved from http://www.eoearth.org/view/article/51cbee807896bb431f6984e2

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