Actinium (Ac)vsErbium (Er)
Actinium (Ac) has a higher Atomic Mass (227 vs 167 u), while Actinium (Ac) has a higher Atomic Number (89 vs 68), while Erbium (Er) has a higher Melting Point (1,802 vs 1,500 K).
Atomic Properties
89
Atomic Number
68
227
Atomic Mass
167
7
Period
6
3
Group
3
Physical Properties
10
Density
9
1,500
Melting Point
1,802
3,500
Boiling Point
3,141
27
Molar Heat Capacity
28
Chemical Properties
1
Electronegativity
1
34
Electron Affinity
30
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).