Actinium (Ac)vsManganese (Mn)
Actinium (Ac) has a higher Electron Affinity (34 vs -50 kJ/mol), while Actinium (Ac) has a higher Atomic Mass (227 vs 55 u), while Actinium (Ac) has a higher Atomic Number (89 vs 25).
Atomic Properties
89
Atomic Number
25
227
Atomic Mass
55
7
Period
4
3
Group
7
Physical Properties
10
Density
7
1,500
Melting Point
1,519
3,500
Boiling Point
2,334
27
Molar Heat Capacity
26
Chemical Properties
1
Electronegativity
2
34
Electron Affinity
-50
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).