Potassium (K)vsProtactinium (Pa)
Protactinium (Pa) has a higher Density (15 vs 1 g/cm³), while Protactinium (Pa) has a higher Atomic Mass (231 vs 39 u), while Protactinium (Pa) has a higher Melting Point (1,841 vs 337 K).
Atomic Properties
19
Atomic Number
91
39
Atomic Mass
231
4
Period
7
1
Group
3
Physical Properties
1
Density
15
337
Melting Point
1,841
1,032
Boiling Point
4,300
30
Molar Heat Capacity
N/A
Chemical Properties
1
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)).