Actinium (Ac)vsSilicon (Si)
Actinium (Ac) has a higher Atomic Mass (227 vs 28 u), while Actinium (Ac) has a higher Atomic Number (89 vs 14), while Silicon (Si) has a higher Group (14 vs 3).
Atomic Properties
89
Atomic Number
14
227
Atomic Mass
28
7
Period
3
3
Group
14
Physical Properties
10
Density
2
1,500
Melting Point
1,687
3,500
Boiling Point
3,538
27
Molar Heat Capacity
20
Chemical Properties
1
Electronegativity
2
34
Electron Affinity
134
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).