Hydrogen (H)vsProtactinium (Pa)
Protactinium (Pa) has a higher Atomic Mass (231 vs 1 u), while Protactinium (Pa) has a higher Boiling Point (4,300 vs 20 K), while Protactinium (Pa) has a higher Density (15 vs 0 g/cm³).
Atomic Properties
1
Atomic Number
91
1
Atomic Mass
231
1
Period
7
1
Group
3
Physical Properties
0
Density
15
14
Melting Point
1,841
20
Boiling Point
4,300
29
Molar Heat Capacity
N/A
Chemical Properties
2
Electronegativity
2
73
Electron Affinity
53
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).