Fermium (Fm)vsPromethium (Pm)
Fermium (Fm) has a higher Electron Affinity (34 vs 12 kJ/mol), while Fermium (Fm) has a higher Atomic Mass (257 vs 145 u), while Fermium (Fm) has a higher Atomic Number (100 vs 61).
Atomic Properties
100
Atomic Number
61
257
Atomic Mass
145
7
Period
6
3
Group
3
Physical Properties
N/A
Density
7
1,800
Melting Point
1,315
N/A
Boiling Point
3,273
N/A
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).