Actinium (Ac)vsMagnesium (Mg)
Actinium (Ac) has a higher Electron Affinity (34 vs -40 kJ/mol), while Actinium (Ac) has a higher Atomic Mass (227 vs 24 u), while Actinium (Ac) has a higher Atomic Number (89 vs 12).
Atomic Properties
89
Atomic Number
12
227
Atomic Mass
24
7
Period
3
3
Group
2
Physical Properties
10
Density
2
1,500
Melting Point
923
3,500
Boiling Point
1,363
27
Molar Heat Capacity
25
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
-40
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).