Actinium (Ac)vsThulium (Tm)
Thulium (Tm) has a higher Electron Affinity (99 vs 34 kJ/mol), while Actinium (Ac) has a higher Boiling Point (3,500 vs 2,223 K), while Actinium (Ac) has a higher Atomic Mass (227 vs 169 u).
Atomic Properties
89
Atomic Number
69
227
Atomic Mass
169
7
Period
6
3
Group
3
Physical Properties
10
Density
9
1,500
Melting Point
1,818
3,500
Boiling Point
2,223
27
Molar Heat Capacity
27
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
99
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).