Protactinium (Pa)vsZirconium (Zr)
Protactinium (Pa) has a higher Atomic Mass (231 vs 91 u), while Protactinium (Pa) has a higher Density (15 vs 7 g/cm³), while Protactinium (Pa) has a higher Atomic Number (91 vs 40).
Atomic Properties
91
Atomic Number
40
231
Atomic Mass
91
7
Period
5
3
Group
4
Physical Properties
15
Density
7
1,841
Melting Point
2,128
4,300
Boiling Point
4,650
N/A
Molar Heat Capacity
25
Chemical Properties
2
Electronegativity
1
53
Electron Affinity
42
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).