Actinium (Ac)vsArsenic (As)
Arsenic (As) has a higher Group (15 vs 3), while Actinium (Ac) has a higher Atomic Mass (227 vs 75 u), while Actinium (Ac) has a higher Atomic Number (89 vs 33).
Atomic Properties
89
Atomic Number
33
227
Atomic Mass
75
7
Period
4
3
Group
15
Physical Properties
10
Density
6
1,500
Melting Point
N/A
3,500
Boiling Point
N/A
27
Molar Heat Capacity
25
Chemical Properties
1
Electronegativity
2
34
Electron Affinity
78
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).