Actinium (Ac)vsIridium (Ir)
Iridium (Ir) has a higher Electron Affinity (151 vs 34 kJ/mol), while Iridium (Ir) has a higher Group (9 vs 3), while Iridium (Ir) has a higher Density (23 vs 10 g/cm³).
Atomic Properties
89
Atomic Number
77
227
Atomic Mass
192
7
Period
6
3
Group
9
Physical Properties
10
Density
23
1,500
Melting Point
2,719
3,500
Boiling Point
4,403
27
Molar Heat Capacity
25
Chemical Properties
1
Electronegativity
2
34
Electron Affinity
151
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).