Beryllium (Be)vsProtactinium (Pa)
Protactinium (Pa) has a higher Electron Affinity (53 vs -48 kJ/mol), while Protactinium (Pa) has a higher Atomic Mass (231 vs 9 u), while Protactinium (Pa) has a higher Atomic Number (91 vs 4).
Atomic Properties
4
Atomic Number
91
9
Atomic Mass
231
2
Period
7
2
Group
3
Physical Properties
2
Density
15
1,560
Melting Point
1,841
2,742
Boiling Point
4,300
16
Molar Heat Capacity
N/A
Chemical Properties
2
Electronegativity
2
-48
Electron Affinity
53
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).