59
Pr
Praseodymium
140.907662
Basic Information
Bohr Model
Descriptive Numbers
Mass
Periodic Position
Classification
Abundance
Color
Atomic Radius
Temperature
Density
Heat
Speed of Sound
Electrical Resistance
Magnetic Properties
Elasticity
Hardness
Etymology
Discovery & Isolation
Production & Use
Radioactivity
Electron Affinity
Dipole Polarity
Lattice
Electron & Quantum
List of Compounds
Basic Information
Name
Praseodymium
Atomic Number
59
Appearance
Grayish white
Phase At STP
Solid
Spectrum Image
Source
WikipediaBohr Model
Static
Interactive
Descriptive Numbers
CAS Number
7440-10-0
CID Number
CID23942
Mendeleev Number
17
Pettifor Number
31
Space Group Number
194
Glawe Number
30
Mass
Atomic Mass
140.907662 Da
Uncertainty
0.00002
Periodic Position
X Position
6
Y Position
8
Period
6
Group
N/A
Classification
Block
f
Category
Lanthanides
Geochemical
Rare Earth and Similars
Goldschmidt
Lithophilic
Electrical Type
Conductive
Abundance
Seawater
6.4e-13 kg/L
Sun
1.4e-7 mole ratio to silicon
Earth Crust
0.0000092 g
Solar System
1.7e-7 mole ratio to silicon
Meteorites
0.0000099 %
Color
Jmol
#D9FFC7
Molcas Gv
#D9FFC7
CPK
#FF1493
Atomic Radius
Empirical
185
Calculated
247
Van Der Waals
10
Rahm
286
Uff
360.6
Mm3
273
Alvarez
292
Covalent (Single Bound)
11
Covalent (Triple Bound)
128
Covalent (Cordero)
203
Covalent (Pyykko)
176
Covalent (Pyykko Double)
138
Covalent (Pyykko Triple)
128
Metallic
182.4
Temperature
Melting/Freeze (USE)
1208 °K
Melting/Freeze (WEL)
1208 °K
Melting/Freeze (CRC)
1204 °K
Melting/Freeze (LNG)
1208 °K
Boiling/Density (USE)
3403 °K
Boiling/Density (WEL)
3563 °K
Boiling/Density (CRC)
3793 °K
Boiling/Density (LNG)
3793 °K
Boiling/Density (Zhang)
3403 °K
Density
STP
6.77 kg/cm³
Solid (WEL)
6640 kg/cm³
Solid (CRC)
6770 kg/cm³
Solid (LNG)
6475 kg/cm³
Liquid (CR2)
6500 kg/cm³
Heat
Molar Volume
20.8 cm³/mol
Atomic Volume
20.8 cm³
Heat Of Fusion USE
11.3 kJ/mol
Heat Of Fusion CRC
6.89 kJ/mol
Heat Of Fusion LNG
6.89 kJ/mol
Heat Of Fusion WEL
6.9 kJ/mol
Evaporation USE
331 kJ/mol
Evaporation LNG
331 kJ/mol
Evaporation WEL
330 kJ/mol
Evaporation Zhang
331 kJ/mol
Molar Heat
27.2 J/molK
Heat Capacity USE
0.192 J/gK
Heat Capacity CRC
27.2 J/gK
Heat Capacity LNG
27.2 J/gK
Heat Capacity WEL
27.2 J/gK
Thermal Conductivity
12.5 W/m*K
Thermal Expansion
0.0000067 1/K
Adiabatic Index
N/A
Speed of Sound
Extensional
2280 m/s
Electrical Resistance
293k
700 nΩm
Magnetic Properties
Order
paramanyetic
Susceptibility
4.2e-7 m3/kg
Elasticity
Shear Modulus
14.8 GPa
Bulk Modulus
28.8 GPa
Poisson Ratio
0.281 ν
Youngs Modulus
37.3 GPa
Hardness
Brinell
250–638
Vickers
250–746
Etymology
Description
It is a soft, silvery metal element found among the lanthanides. Its only natural isotope is Pr-141 and it is not radioactive. 14 radioactive isotopes have been obtained artificially. It is used in rare earth alloys. In 1885 C.A. It was discovered by von Welsbach.
Language Of Origin
Greek
Origin Of Word
From the Greek phrase praseios didymos, meaning "green twin"
Meaning
green twin
Symbol Origin
descriptive
Etymological Description
From the Greek expression prasios didymos, meaning "green twin". Didymium is divided into praseodymium and neodymium with different colored salts. Praseodymium oxide is green.
Discovery & Isolation
Observed/Predicted By
C. A. von Welsbach
Observed/Discovery Year
1885
Discovery Location
Production & Use
Sources
It is obtained from the same salts as neodymium.
Uses
It is used together with neodymium in the production of lenses in glaziers' protective glasses, as it filters the yellow light during the glass blowing process. When alloyed with magnesium, a high-strength metal used in aircraft engines is obtained. It constitutes 5% of Misch metal
Radioactivity
Half Life
Stable
Lifetime
Stable
Neutron Mass Absorption
0.0029
Neutron Cross Section
11.4
Electron Affinity
Electron Affinity (eV)
0.962
Electron Affinity (kJ/mol)
93
Electron Affinity (pauling)
1.13
Electron Affinity (ghosh)
0.17208
Dipole Polarity
Accepted
216
Uncertainty
20
C6 GB
3760
Lattice
Constant Internal Default Radius
3.67
Constant
367.25, 367.25, 1183.54
Strucutre
HEX
Angles
π/2, π/2, 2 π/3
Electron & Quantum
Oxidation States
0,1,2,3,4,5
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f3
Quantum Number
4 Y/A
Electron Configuration Semantic
[Car] 4f3 6s2
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
21
Shells-4
8
Shells-5
2
Ionization Energies-0
527
Ionization Energies-1
1020
Ionization Energies-2
2086
Ionization Energies-3
3761
Ionization Energies-4
5551
List of Compounds
1-10 of 44 compounds
| Formula | Names |
|---|---|
| Pr | praseodymium praseodymium metal |
| PrBr3 | praseodymium(III)bromide tribromopraseodymium |
| PrCl3 | praseodymium(III) chloride praseodymium chloride praseodymium trichloride trichloropraseodymium |
| PrF3 | praseodymium fluoride praseodymium trifluoride trifluoropraseodymium |
| PrI3 | praseodymium(III)iodide triiodopraseodymium |
| NPr | praseodymium nitride |
| Pr2O3 | prasedymium(III)oxide |
| Pr6O11 | praseodymium oxide hexapraseodymium undecaoxide praseodymium (III,IV) oxide praseodymium undecaoxide |
| PrB6 | praseodymium boride |
| PrF4 | praseodymium(IV) fluoride |
