Actinium (Ac)vsLanthanum (La)
Actinium (Ac) has a higher Atomic Mass (227 vs 139 u), while Actinium (Ac) has a higher Density (10 vs 6 g/cm³), while Lanthanum (La) has a higher Electron Affinity (53 vs 34 kJ/mol).
Atomic Properties
89
Atomic Number
57
227
Atomic Mass
139
7
Period
6
3
Group
3
Physical Properties
10
Density
6
1,500
Melting Point
1,193
3,500
Boiling Point
3,737
27
Molar Heat Capacity
27
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
53
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).