Actinium (Ac)vsCalcium (Ca)
Actinium (Ac) has a higher Electron Affinity (34 vs 2 kJ/mol), while Actinium (Ac) has a higher Density (10 vs 2 g/cm³), while Actinium (Ac) has a higher Atomic Mass (227 vs 40 u).
Atomic Properties
89
Atomic Number
20
227
Atomic Mass
40
7
Period
4
3
Group
2
Physical Properties
10
Density
2
1,500
Melting Point
1,115
3,500
Boiling Point
1,757
27
Molar Heat Capacity
26
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
2
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).