Promethium (Pm)vsThorium (Th)
Thorium (Th) has a higher Electron Affinity (113 vs 12 kJ/mol), while Thorium (Th) has a higher Density (12 vs 7 g/cm³), while Thorium (Th) has a higher Atomic Mass (232 vs 145 u).
Atomic Properties
61
Atomic Number
90
145
Atomic Mass
232
6
Period
7
3
Group
3
Physical Properties
7
Density
12
1,315
Melting Point
2,023
3,273
Boiling Point
5,061
N/A
Molar Heat Capacity
26
Chemical Properties
1
Electronegativity
1
12
Electron Affinity
113
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).