Cobalt (Co)vsPromethium (Pm)
Cobalt (Co) has a higher Electron Affinity (64 vs 12 kJ/mol), while Cobalt (Co) has a higher Group (9 vs 3), while Promethium (Pm) has a higher Atomic Mass (145 vs 59 u).
Atomic Properties
27
Atomic Number
61
59
Atomic Mass
145
4
Period
6
9
Group
3
Physical Properties
9
Density
7
1,768
Melting Point
1,315
3,200
Boiling Point
3,273
25
Molar Heat Capacity
N/A
Chemical Properties
2
Electronegativity
1
64
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).