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Lanthanum (La)
Atomic number: 57 · Category: lanthanide · Group 3 · Period 6 · Phase: Solid
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.
Atomic mass: 138.905477
Density: 6.162
Melting point: 1193 K
Boiling point: 3737 K
Appearance: silvery white
Source: Wikipedia
Block: f
Molar heat: 27.11
CPK color:#70d4ff
Electronic structure
Electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 5d1
Configuration (semantic): [Xe] 5d16s2
Shells: 2, 8, 18, 18, 9, 2
Electronegativity (Pauling): 1.1
Electron affinity: 53
Ionization energies: 538.1, 1067, 1850.3, 4819, 5940
Periodic position
Group: 3
Period: 6
xpos: 3
ypos: 9
Spectral/Bohr images
Image
3D Model