Lanthanum (La)vsProtactinium (Pa)
Protactinium (Pa) has a higher Density (15 vs 6 g/cm³), while Protactinium (Pa) has a higher Atomic Mass (231 vs 139 u), while Protactinium (Pa) has a higher Atomic Number (91 vs 57).
Atomic Properties
57
Atomic Number
91
139
Atomic Mass
231
6
Period
7
3
Group
3
Physical Properties
6
Density
15
1,193
Melting Point
1,841
3,737
Boiling Point
4,300
27
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
2
53
Electron Affinity
53
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).