Barium (Ba)vsPromethium (Pm)
Promethium (Pm) has a higher Density (7 vs 4 g/cm³), while Promethium (Pm) has a higher Boiling Point (3,273 vs 2,118 K), while Promethium (Pm) has a higher Group (3 vs 2).
Atomic Properties
56
Atomic Number
61
137
Atomic Mass
145
6
Period
6
2
Group
3
Physical Properties
4
Density
7
1,000
Melting Point
1,315
2,118
Boiling Point
3,273
28
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
1
14
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).