Argon (Ar)vsPromethium (Pm)
Promethium (Pm) has a higher Electron Affinity (12 vs -96 kJ/mol), while Promethium (Pm) has a higher Boiling Point (3,273 vs 87 K), while Promethium (Pm) has a higher Melting Point (1,315 vs 84 K).
Atomic Properties
18
Atomic Number
61
40
Atomic Mass
145
3
Period
6
18
Group
3
Physical Properties
2
Density
7
84
Melting Point
1,315
87
Boiling Point
3,273
N/A
Molar Heat Capacity
N/A
Chemical Properties
N/A
Electronegativity
1
-96
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).