Element Name: Lanthanum
Atomic No.: La
State (298 K): solid
Uses: medical
Atomic Mass: 138.91 g/mol
Density: 6.15 g/cm
3
B.P.: 3730 K
F.P.: 1194 K
Electronic Configuration: 1s
2
2s
2
2p
6
3s
2
3p
6
3d
10
4s
2
4p
6
4d
10
5s
2
5p
6
5d
1
6s
2
Isotopes:
138
La 137.9068 amu (0.09%)
139
La 138.9061 amu (99.91%)
Electronegativity: 1.10
Radius: 169 pm (covalent)
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