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Elemental Periodic Table

promethium

Atomic number: 61
Atomic weight: 145
Symbol: Pm
Group number: (lanthanide)
Electronic configuration: [Xe].4f5.6s2


Physical data

Standard state: solid at 298 K
Colour: metallic
Density of solid at ambient temperature/kg m-3: 7264
Molar volume/cm3: 20.23


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