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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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