Actinium (Ac)vsBoron (B)
Actinium (Ac) has a higher Atomic Mass (227 vs 11 u), while Actinium (Ac) has a higher Atomic Number (89 vs 5), while Actinium (Ac) has a higher Density (10 vs 2 g/cm³).
Atomic Properties
89
Atomic Number
5
227
Atomic Mass
11
7
Period
2
3
Group
13
Physical Properties
10
Density
2
1,500
Melting Point
2,349
3,500
Boiling Point
4,200
27
Molar Heat Capacity
11
Chemical Properties
1
Electronegativity
2
34
Electron Affinity
27
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).