Protactinium (Pa)vsSilicon (Si)
Protactinium (Pa) has a higher Atomic Mass (231 vs 28 u), while Protactinium (Pa) has a higher Density (15 vs 2 g/cm³), while Protactinium (Pa) has a higher Atomic Number (91 vs 14).
Atomic Properties
91
Atomic Number
14
231
Atomic Mass
28
7
Period
3
3
Group
14
Physical Properties
15
Density
2
1,841
Melting Point
1,687
4,300
Boiling Point
3,538
N/A
Molar Heat Capacity
20
Chemical Properties
2
Electronegativity
2
53
Electron Affinity
134
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).