Calcium (Ca)vsPromethium (Pm)
Promethium (Pm) has a higher Electron Affinity (12 vs 2 kJ/mol), while Promethium (Pm) has a higher Density (7 vs 2 g/cm³), while Promethium (Pm) has a higher Atomic Mass (145 vs 40 u).
Atomic Properties
20
Atomic Number
61
40
Atomic Mass
145
4
Period
6
2
Group
3
Physical Properties
2
Density
7
1,115
Melting Point
1,315
1,757
Boiling Point
3,273
26
Molar Heat Capacity
N/A
Chemical Properties
1
Electronegativity
1
2
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).