Iron (Fe)vsProtactinium (Pa)
Protactinium (Pa) has a higher Atomic Mass (231 vs 56 u), while Protactinium (Pa) has a higher Electron Affinity (53 vs 15 kJ/mol), while Protactinium (Pa) has a higher Atomic Number (91 vs 26).
Atomic Properties
26
Atomic Number
91
56
Atomic Mass
231
4
Period
7
8
Group
3
Physical Properties
8
Density
15
1,811
Melting Point
1,841
3,134
Boiling Point
4,300
25
Molar Heat Capacity
N/A
Chemical Properties
2
Electronegativity
2
15
Electron Affinity
53
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).