Actinium (Ac)vsPotassium (K)
Actinium (Ac) has a higher Density (10 vs 1 g/cm³), while Actinium (Ac) has a higher Atomic Mass (227 vs 39 u), while Actinium (Ac) has a higher Atomic Number (89 vs 19).
Atomic Properties
89
Atomic Number
19
227
Atomic Mass
39
7
Period
4
3
Group
1
Physical Properties
10
Density
1
1,500
Melting Point
337
3,500
Boiling Point
1,032
27
Molar Heat Capacity
30
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
48
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).