57
La
Lanthanum
138.905477
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
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
7439-91-0
CID Number
CID23926
DOT Number
3178
Mendeleev Number
13
Pettifor Number
33
Space Group Number
194
Glawe Number
32
Mass
Atomic Mass
138.905477 Da
Uncertainty
0.00007
Periodic Position
X Position
4
Y Position
8
Period
6
Group
N/A
Classification
Block
f
Category
Lanthanides
Geochemical
Rare Earth and Similars
Goldschmidt
Lithophilic
Electrical Type
Conductive
Abundance
Urban Soil
0.034 mg/kg
Seawater
3.4e-12 kg/L
Sun
5e-7 mole ratio to silicon
Earth Crust
0.000039 g
Solar System
4.4e-7 mole ratio to silicon
Meteorites
0.000028 %
Color
Jmol
#70D4FF
Molcas Gv
#70D4FF
CPK
#FF1493
Atomic Radius
Empirical
195
Calculated
195
Batsanov
250
Rahm
284
Uff
352.2
Mm3
278
Alvarez
298
Covalent (Single Bound)
169
Covalent (Triple Bound)
139
Covalent (Cordero)
207
Covalent (Pyykko)
180
Covalent (Pyykko Double)
139
Covalent (Pyykko Triple)
139
Mendeleev
169
C12
187
Metallic
187
Temperature
Melting/Freeze (USE)
1193 °K
Melting/Freeze (WEL)
1193 °K
Melting/Freeze (CRC)
1191 °K
Melting/Freeze (LNG)
1193 °K
Boiling/Density (USE)
3737 °K
Boiling/Density (WEL)
3743 °K
Boiling/Density (CRC)
3737 °K
Boiling/Density (LNG)
3737 °K
Boiling/Density (Zhang)
3743 °K
Superconducting Point
4.88 °K
Density
STP
6.162 kg/cm³
Solid (WEL)
6146 kg/cm³
Solid (CRC)
6150 kg/cm³
Solid (LNG)
6162 kg/cm³
Liquid (CR2)
5940 kg/cm³
Heat
Molar Volume
22.39 cm³/mol
Atomic Volume
22.5 cm³
Heat Of Fusion USE
8.5 kJ/mol
Heat Of Fusion CRC
6.2 kJ/mol
Heat Of Fusion LNG
6.2 kJ/mol
Heat Of Fusion WEL
6.2 kJ/mol
Evaporation USE
402 kJ/mol
Evaporation LNG
402.1 kJ/mol
Evaporation WEL
400 kJ/mol
Evaporation Zhang
400 kJ/mol
Molar Heat
27.11 J/molK
Heat Capacity USE
0.197 J/gK
Heat Capacity CRC
27.11 J/gK
Heat Capacity LNG
27.11 J/gK
Heat Capacity WEL
27.1 J/gK
Thermal Conductivity
13.4 W/m*K
Thermal Expansion
0.0000121 1/K
Adiabatic Index
N/A
Speed of Sound
Extensional
2475 m/s
Electrical Resistance
293k
615 nΩm
Magnetic Properties
Order
paramanyetic
Susceptibility
1.1e-8 m3/kg
Elasticity
Shear Modulus
14.3 GPa
Bulk Modulus
27.9 GPa
Poisson Ratio
0.28 ν
Youngs Modulus
36.6 GPa
Hardness
Mohs
2.5
Brinell
350–400
Vickers
360–1750
Etymology
Description
Silvery (from the Greek word lathanein meaning "to be hidden") is a metal element belonging to the third group and is often seen as one of the lanthanides. It is found in some rare earth minerals. It has 25 natural isotopes. La-139 is stable, while La-138 has a half-life of 10^10 to 10^15 years. The other 23 isotopes are radioactive. It is chemically similar to lanthanides. Lanthanum is low to moderately toxic and should be used with caution. In 1839 C.G. It was discovered by Mosander.
Language Of Origin
Greek
Origin Of Word
From the Greek word kanthanein meaning "to be hidden"
Meaning
stay hidden
Etymological Description
It comes from the Greek word lanthanein, meaning to remain hidden.
Discovery & Isolation
Observed/Predicted By
Mr. Mosander
Observed/Discovery Year
1838
Discovery Location
Isolated Sample By
Mr. Mosander
Isolated Sample Year
1841
Production & Use
Sources
It is found together with rare earth elements in monazite and bastnesite minerals. Monazite sand typically contains 25% lanthanum.
Uses
It is used in the electrodes of high-intensity, carbon arc lamps. It is also used in the production of quality europium metal. It is found in expensive camera lenses because it provides light refracting properties to glass.
Radioactivity
Half Life
Stable
Lifetime
Stable
Neutron Mass Absorption
0.0023
Neutron Cross Section
8.98
Electron Affinity
Proton Affinity
1013
Electron Affinity (eV)
0.47
Electron Affinity (kJ/mol)
53
Electron Affinity (pauling)
1.1
Electron Affinity (ghosh)
0.163142
Dipole Polarity
Accepted
215
Uncertainty
20
C6 GB
3730
Lattice
Constant Internal Default Radius
3.75
Constant
377.2, 377.2, 1214.4
Strucutre
HEX
Angles
π/2, π/2, 2 π/3
Electron & Quantum
Oxidation States
0,1,2,3
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 5d1
Quantum Number
I put/a
Electron Configuration Semantic
[Vehicle] 5d16s2
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
18
Shells-4
9
Shells-5
2
Ionization Energies-0
538.1
Ionization Energies-1
1067
Ionization Energies-2
1850.3
Ionization Energies-3
4819
Ionization Energies-4
5940
List of Compounds
1-10 of 41 compounds
| Formula | Names |
|---|---|
| La | lanthanum lanthanum metal |
| Br3La | lanthanum bromide lanthamum bromide lanthanum tribromide tribromolanthanum |
| LaC2La | lanthanum carbide lanthanum dicarbide |
| LaCl3 | lanthanum(III)chloride trichlorolanthanum |
| LaF3 | lanthanum fluoride lanthanum trifluoride trifluorolanthanum tysonite |
| H3La | lanthanum hydride lanthanum trihydride |
| I3La | lanthanum iodide lanthanum(III) iodide lanthanum triiodide triiodolanthanum |
| LaB6 | lanthanum hexaboride lanthanum boride |
| LaN | lanthanum nitride |
| LaS | lanthanum monosulfide |
