Actinium (Ac)vsPromethium (Pm)
Actinium (Ac) has a higher Electron Affinity (34 vs 12 kJ/mol), while Actinium (Ac) has a higher Atomic Mass (227 vs 145 u), while Actinium (Ac) has a higher Atomic Number (89 vs 61).
Atomic Properties
89
Atomic Number
61
227
Atomic Mass
145
7
Period
6
3
Group
3
Physical Properties
10
Density
7
1,500
Melting Point
1,315
3,500
Boiling Point
3,273
27
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).