Name: Lanthanum
Symbol: La
Atomic Number: 57
Atomic Weight: 138,9055 g/mol
Oxidation States: 3
Boiling Point: 3737 K
Melting Point: 1191 K
Density: 6,15 g/cm³
Electron Configuration: [Xe]5d1,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,10
Heat of Vaporization: 399,57 kJ/mol
Heat of Fusion: 11,3 kJ/mol
Electrical Conductivity: 1,9 10⁶ (Om cm)^-1
Thermal Conductivity: 13,5 W/(m K) (at 300 K)
Specific Heat Capacity: 0,19 J/(g K) (at 300 K)
First Ionization Potential: 5,58
Atomic Volume: 22,5 cm³/mol
Atomic Radius: 1,38 A
Covalent Radius: 1,25 A
Synthetic: No
Discovery: 1839; Mosander; Stockholm, Sweden
Note: review

Name: Cerium
Symbol: Ce
Atomic Number: 58
Atomic Weight: 140,12 g/mol
Oxidation States: 3,4
Boiling Point: 3715 K
Melting Point: 1071 K
Density: 6,77 g/cm³
Electron Configuration: [Xe]4f2,6s2
Acid/Base Properties: Basic
Crystal Structure: Cubic, face centered
Electronegativity: 1,12
Heat of Vaporization: 313,8 kJ/mol
Heat of Fusion: 9,20 kJ/mol
Electrical Conductivity: 1,4 10⁶ (Om cm)^-1
Thermal Conductivity: 11,4 W/(m K) (at 300 K)
Specific Heat Capacity: 0,19 J/(g K) (at 300 K)
First Ionization Potential: 5,47
Atomic Volume: 21,0 cm³/mol
Atomic Radius: 1,81 A
Covalent Radius: 1,65 A
Synthetic: No
Discovery: 1803; Berzelius and Hisinger; Sweden
Note: review

Name: Praseodymium
Symbol: Pr
Atomic Number: 59
Atomic Weight: 140,9077 g/mol
Oxidation States: 3,4
Boiling Point: 3785 K
Melting Point: 1204 K
Density: 6,77 g/cm³
Electron Configuration: [Xe]4f3,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,13
Heat of Vaporization: 332,63 kJ/mol
Heat of Fusion: 10,04 kJ/mol
Electrical Conductivity: 1,5 10⁶ (Om cm)^-1
Thermal Conductivity: 12,5 W/(m K) (at 300 K)
Specific Heat Capacity: 0,193 J/(g K) (at 300 K)
First Ionization Potential: 5,42
Atomic Volume: 20,8 cm³/mol
Atomic Radius: 1,82 A
Covalent Radius: 1,65 A
Synthetic: No
Discovery: 1885; von Welsbach; Vienna, Austria
Note: review

Name: Neodymium
Symbol: Nd
Atomic Number: 60
Atomic Weight: 144,24 g/mol
Oxidation States: 3
Boiling Point: 3347 K
Melting Point: 1294 K
Density: 6,77 g/cm³
Electron Configuration: [Xe]4f4,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,14
Heat of Vaporization: 283,68 kJ/mol
Heat of Fusion: 10,88 kJ/mol
Electrical Conductivity: 1,6 10⁶ (Om cm)^-1
Thermal Conductivity: 16,5 W/(m K) (at 300 K)
Specific Heat Capacity: 0,190 J/(g K) (at 300 K)
First Ionization Potential: 5,49
Atomic Volume: 20,6 cm³/mol
Atomic Radius: 1,82 A
Covalent Radius: 1,64 A
Synthetic: No
Discovery: 1885; von Welsbach; Vienna, Austria
Note: review

Name: Promethium
Symbol: Pm
Atomic Number: 61
Atomic Weight: 145 (most stable) g/mol
Oxidation States: 3
Boiling Point: 3273 K
Melting Point: 1315 K
Density: 7,22 g/cm³
Electron Configuration: [Xe]4f5,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,13
Electrical Conductivity: 2 10⁶ (Om cm)^-1
Thermal Conductivity: 17,9 (300K) (Wm K)^-1 (at 300 K)
First Ionization Potential: 5,55
Atomic Volume: 22,4 cm³/mol
Covalent Radius: 1,63 A
Synthetic: Yes
Discovery: 1945; by Marinsky in the USA
Note: review

Name: Samarium
Symbol: Sm
Atomic Number: 62
Atomic Weight: 150,36 g/mol
Oxidation States: 3, 2
Boiling Point: 2067 K
Melting Point: 1347 K
Density: 7,52 g/cm³
Electron Configuration: [Xe]4f6,6s2
Acid/Base Properties: Basic
Crystal Structure: Rhombohedral
Electronegativity: 1,17
Heat of Vaporization: 191,63 kJ/mol
Heat of Fusion: 11,09 kJ/mol
Electrical Conductivity: 1,1 10⁶ (Om cm)^-1
Thermal Conductivity: 13,3 W/(m K) (at 300 K)
Specific Heat Capacity: 0,197 J/(g K) (at 300 K)
First Ionization Potential: 5,63
Atomic Volume: 19,90 cm³/mol
Atomic Radius: 1,81 A
Covalent Radius: 1,62 A
Synthetic: No
Discovery: 1879; de Boisbaudan; Paris, France
Note: review

Name: Europium
Symbol: Eu
Atomic Number: 63
Atomic Weight: 151,965 g/mol
Oxidation States: 3, 2
Boiling Point: 1800 K
Melting Point: 1095 K
Density: 5,24 g/cm³
Electron Configuration: [Xe]4f7,6s2
Acid/Base Properties: Basic
Crystal Structure: Cubic, body centered
Electronegativity: 1,2
Heat of Vaporization: 175,73 kJ/mol
Heat of Fusion: 10,46 kJ/mol
Electrical Conductivity: 1,1 10⁶ (Om cm)^-1
Thermal Conductivity: 13,9 W/(m K) (at 300 K)
Specific Heat Capacity: 0,182 J/(g K) (at 300 K)
First Ionization Potential: 5,67
Atomic Volume: 28,9 cm³/mol
Atomic Radius: 1,99 A
Covalent Radius: 1,85 A
Synthetic: No
Discovery: 1901; Demarcay in Paris, France
Note: review

Name: Gadolinium
Symbol: Gd
Atomic Number: 64
Atomic Weight: 157,25 g/mol
Oxidation States: 3
Boiling Point: 3545 K
Melting Point: 1585 K
Density: 7,90 g/cm³
Electron Configuration: [Xe]4f7,5d1,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,20
Heat of Vaporization: 311,71 kJ/mol
Heat of Fusion: 15,48 kJ/mol
Electrical Conductivity: 0,8 10⁶ (Om cm)^-1
Thermal Conductivity: 10,6 W/(m K) (at 300 K)
Specific Heat Capacity: 0,236 J/(g K) (at 300 K)
First Ionization Potential: 6,15
Atomic Volume: 19,9 cm³/mol
Atomic Radius: 1,80 A
Covalent Radius: 1,61 A
Synthetic: No
Discovery: 1880; deMarignac; Geneva, Switzerland
Note: review

Name: Terbium
Symbol: Tb
Atomic Number: 65
Atomic Weight: 158,9253 g/mol
Oxidation States: 3, 4
Boiling Point: 3500 K
Melting Point: 1629 K
Density: 8,23 g/cm³
Electron Configuration: [Xe]4f9,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,1
Electrical Conductivity: 0,9 10⁶ (Om cm)^-1
Thermal Conductivity: 11,1 W/(m K) (at 300 K)
Specific Heat Capacity: 0,18 J/(g K) (at 300 K)
First Ionization Potential: 5,86
Atomic Volume: 19,2 cm³/mol
Atomic Radius: 1,80 A
Covalent Radius: 1,59 A
Synthetic: No
Discovery: 1843; Mosander; Stockholm, Sweden
Note: review

Name: Dysprosium
Symbol: Dy
Atomic Number: 66
Atomic Weight: 162,50 g/mol
Oxidation States: 3
Boiling Point: 2840 K
Melting Point: 1685 K
Density: 8,55 g/cm³
Electron Configuration: [Xe]4f10,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,22
Heat of Vaporization: 230 kJ/mol
Heat of Fusion: 11,06 kJ/mol
Electrical Conductivity: 1,1 10⁶ (Om cm)^-1
Thermal Conductivity: 10,7 W/(m K) (at 300 K)
Specific Heat Capacity: 0,173 J/(g K) (at 300 K)
First Ionization Potential: 5,93
Atomic Volume: 19,0 cm³/mol
Atomic Radius: 1,80 A
Covalent Radius: 1,59 A
Synthetic: No
Discovery: 1886; de Boisbaudan; Paris, France
Note: review

Name: Holmium
Symbol: Ho
Atomic Number: 67
Atomic Weight: 164,9303 g/mol
Oxidation States: 3
Boiling Point: 2968 K
Melting Point: 1747 K
Density: 8,80 g/cm³
Electron Configuration: [Xe]4f11,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,23
Heat of Vaporization: 251,04 kJ/mol
Heat of Fusion: 17,15 kJ/mol
Electrical Conductivity: 1,1 10⁶ (Om cm)^-1
Thermal Conductivity: 16,2 W/(m K) (at 300 K)
Specific Heat Capacity: 0,165 J/(g K) (at 300 K)
First Ionization Potential: 6,02
Atomic Volume: 18,7 cm³/mol
Atomic Radius: 1,79 A
Covalent Radius: 1,58 A
Synthetic: No
Discovery: 1878; by Cleve in Uppsala, Sweden
Note: review

Name: Erbium
Symbol: Er
Atomic Number: 68
Atomic Weight: 167,26 g/mol
Oxidation States: 3
Boiling Point: 3140 K
Melting Point: 1802 K
Density: 9,07 g/cm³
Electron Configuration: [Xe]4f12,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,24
Heat of Vaporization: 292,88 kJ/mol
Heat of Fusion: 17,15 kJ/mol
Electrical Conductivity: 1,2 10⁶ (Om cm)^-1
Thermal Conductivity: 14,3 W/(m K) (at 300 K)
Specific Heat Capacity: 0,168 J/(g K) (at 300 K)
First Ionization Potential: 6,101
Atomic Volume: 18,4 cm³/mol
Atomic Radius: 1,78 A
Covalent Radius: 1,57 A
Synthetic: No
Discovery: 1842; Mosander; Stockholm, Sweden
Note: review

Name: Thulium
Symbol: Tm
Atomic Number: 69
Atomic Weight: 168,9342 g/mol
Oxidation States: 3, 2
Boiling Point: 2223 K
Melting Point: 1818 K
Density: 9,32 g/cm³
Electron Configuration: [Xe]4f13,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,25
Heat of Vaporization: 191 kJ/mol
Heat of Fusion: 16,8 kJ/mol
Electrical Conductivity: 1,3 10⁶ (Om cm)^-1
Thermal Conductivity: 16,8 W/(m K) (at 300 K)
Specific Heat Capacity: 0,16 J/(g K) (at 300 K)
First Ionization Potential: 6,184
Atomic Volume: 18,1 cm³/mol
Atomic Radius: 1,77 A
Covalent Radius: 1,56 A
Synthetic: No
Discovery: 1879; by Cleve in Uppsala, Sweden
Note: review

Name: Ytterbium
Symbol: Yb
Atomic Number: 70
Atomic Weight: 173,04 g/mol
Oxidation States: 3, 2
Boiling Point: 1469 K
Melting Point: 1092 K
Density: 6,97 g/cm³
Electron Configuration: [Xe]4f14,6s2
Acid/Base Properties: Basic
Crystal Structure: Cubic, face centered
Electronegativity: 1,1
Heat of Vaporization: 128 kJ/mol
Heat of Fusion: 7,7 kJ/mol
Electrical Conductivity: 3,7 10⁶ (Om cm)^-1
Thermal Conductivity: 34,9 W/(m K) (at 300 K)
Specific Heat Capacity: 0,155 J/(g K) (at 300 K)
First Ionization Potential: 6,254
Atomic Volume: 24,8 cm³/mol
Atomic Radius: 1,94 A
Covalent Radius: 1,70 A
Synthetic: No
Discovery: 1878; deMarignac; Geneva, Switzerland
Note: review

Name: Lutetium
Symbol: Lu
Atomic Number: 71
Atomic Weight: 174,967 g/mol
Oxidation States: 3
Boiling Point: 3668 K
Melting Point: 1936 K
Density: 9,84 g/cm³
Electron Configuration: [Xe]4f14,5d1,6s2
Acid/Base Properties: Basic
Crystal Structure: Hexagonal
Electronegativity: 1,27
Heat of Vaporization: 355 kJ/mol
Heat of Fusion: 18,6 kJ/mol
Electrical Conductivity: 1,5 10⁶ (Om cm)^-1
Thermal Conductivity: 16,4 W/(m K) (at 300 K)
Specific Heat Capacity: 0,15 J/(g K) (at 300 K)
First Ionization Potential: 5,43
Atomic Volume: 17,8 cm³/mol
Atomic Radius: 1,75 A
Covalent Radius: 1,56 A
Synthetic: No
Discovery: 1907; by Urbain in Paris, France
Note: review