Actinium (Ac)vsNeptunium (Np)
Neptunium (Np) has a higher Density (20 vs 10 g/cm³), while Actinium (Ac) has a higher Melting Point (1,500 vs 912 K), while Neptunium (Np) has a higher Electron Affinity (46 vs 34 kJ/mol).
Atomic Properties
89
Atomic Number
93
227
Atomic Mass
237
7
Period
7
3
Group
3
Physical Properties
10
Density
20
1,500
Melting Point
912
3,500
Boiling Point
4,447
27
Molar Heat Capacity
29
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
46
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).