57
La
Lanthanum
138.905477
28181892
#57
Lanthanum
lanthanide· Solid·138.905477 u
Lanthanum is a soft, ductile, silvery-white metallic chemical element with symbol La and atomic number 57. It tarnishes rapidly when exposed to air and is soft enough to be cut with a knife. It gave its name to the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table:it is also sometimes considered the first element of the 6th-period transition metals.
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Identity
- Symbol
- La
- Atomic Number
- 57
- Atomic Mass
- 138.905477 u
- Category
- lanthanide
- Block
- f-block
- Period
- 6
- Group
- 3
- Appearance
- silvery white
- Year Discovered
- 1839 CE
- Discovered By
- Carl Gustaf Mosander
- Named By
- hiding
Electrons
- Configuration
- [Xe] 5d16s2
- Full Configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 5d1
- Shells
- 2, 8, 18, 18, 9, 2
- Electronegativity
- 1.1
- Electron Affinity
- 53
- Oxidation States
- +3
- Ionization Energies
- 538.1, 1067, 1850.3, 4819, 5940
Physical Properties
- State at
- Solid
- Melting Point
- 1193
- Boiling Point
- 3737
- Density
- 6.162
- Molar Heat
- 27.11 J/(mol·K)
- Crystal Structure
- HEX
- Magnetic Ordering
- Paramagnetic
Mechanical
- Covalent Radius
- 207 pm
- Metallic Radius
- 187 pm
- Mohs Hardness
- 2.5
- Brinell Hardness
- 363 MPa MPa
- Vickers Hardness
- 491 MPa MPa
- Bulk Modulus
- 27.9 GPa GPa
- Shear Modulus
- 14.3 GPa GPa
- Young's Modulus
- 36.6 GPa GPa
Thermal & Electrical
- Thermal Conductivity
- 13.4 W/(m K) W/(m·K)
- Electrical Conductivity
- 1.63 MS/m S/m
- Specific Heat
- 195 J/(kg K) J/(g·K)
- Heat of Vaporization
- 400 kJ/mol kJ/mol
- Heat of Fusion
- 6.2 kJ/mol kJ/mol
Abundance
- Universe
- 2.00 ppb
- Sun
- 2.00 ppb
- Meteorite
- 180 ppb
- Earth's Crust
- 39 ppm
- Ocean
- 3.40 ppt
- Human Body
- 0