Actinium (Ac)vsProtactinium (Pa)
Protactinium (Pa) has a higher Electron Affinity (53 vs 34 kJ/mol), while Protactinium (Pa) has a higher Density (15 vs 10 g/cm³), while Protactinium (Pa) has a higher Electronegativity (2 vs 1 Pauling).
Atomic Properties
89
Atomic Number
91
227
Atomic Mass
231
7
Period
7
3
Group
3
Physical Properties
10
Density
15
1,500
Melting Point
1,841
3,500
Boiling Point
4,300
27
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
2
34
Electron Affinity
53
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).