Actinium (Ac)vsNiobium (Nb)
Niobium (Nb) has a higher Electron Affinity (89 vs 34 kJ/mol), while Actinium (Ac) has a higher Atomic Mass (227 vs 93 u), while Actinium (Ac) has a higher Atomic Number (89 vs 41).
Atomic Properties
89
Atomic Number
41
227
Atomic Mass
93
7
Period
5
3
Group
5
Physical Properties
10
Density
9
1,500
Melting Point
2,750
3,500
Boiling Point
5,017
27
Molar Heat Capacity
25
Chemical Properties
1
Electronegativity
2
34
Electron Affinity
89
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).