Actinium (Ac)vsHelium (He)
Actinium (Ac) has a higher Electron Affinity (34 vs -48 kJ/mol), while Actinium (Ac) has a higher Melting Point (1,500 vs 1 K), while Actinium (Ac) has a higher Boiling Point (3,500 vs 4 K).
Atomic Properties
89
Atomic Number
2
227
Atomic Mass
4
7
Period
1
3
Group
18
Physical Properties
10
Density
0
1,500
Melting Point
1
3,500
Boiling Point
4
27
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
N/A
34
Electron Affinity
-48
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).