Promethium (Pm)vsProtactinium (Pa)
Protactinium (Pa) has a higher Electron Affinity (53 vs 12 kJ/mol), while Protactinium (Pa) has a higher Density (15 vs 7 g/cm³), while Protactinium (Pa) has a higher Atomic Mass (231 vs 145 u).
Atomic Properties
61
Atomic Number
91
145
Atomic Mass
231
6
Period
7
3
Group
3
Physical Properties
7
Density
15
1,315
Melting Point
1,841
3,273
Boiling Point
4,300
N/A
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
2
12
Electron Affinity
53
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).