Actinium (Ac)vsCobalt (Co)
Actinium (Ac) has a higher Atomic Mass (227 vs 59 u), while Actinium (Ac) has a higher Atomic Number (89 vs 27), while Cobalt (Co) has a higher Group (9 vs 3).
Atomic Properties
89
Atomic Number
27
227
Atomic Mass
59
7
Period
4
3
Group
9
Physical Properties
10
Density
9
1,500
Melting Point
1,768
3,500
Boiling Point
3,200
27
Molar Heat Capacity
25
Chemical Properties
1
Electronegativity
2
34
Electron Affinity
64
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).