Cesium (Cs)vsPromethium (Pm)
Promethium (Pm) has a higher Melting Point (1,315 vs 302 K), while Promethium (Pm) has a higher Density (7 vs 2 g/cm³), while Cesium (Cs) has a higher Electron Affinity (46 vs 12 kJ/mol).
Atomic Properties
55
Atomic Number
61
133
Atomic Mass
145
6
Period
6
1
Group
3
Physical Properties
2
Density
7
302
Melting Point
1,315
944
Boiling Point
3,273
32
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
1
46
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).