Actinium (Ac)vsHafnium (Hf)
Actinium (Ac) has a higher Electron Affinity (34 vs 17 kJ/mol), while Hafnium (Hf) has a higher Melting Point (2,506 vs 1,500 K), while Hafnium (Hf) has a higher Boiling Point (4,876 vs 3,500 K).
Atomic Properties
89
Atomic Number
72
227
Atomic Mass
178
7
Period
6
3
Group
4
Physical Properties
10
Density
13
1,500
Melting Point
2,506
3,500
Boiling Point
4,876
27
Molar Heat Capacity
26
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
17
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).