Hydrogen (H)vsPromethium (Pm)
Promethium (Pm) has a higher Boiling Point (3,273 vs 20 K), while Promethium (Pm) has a higher Atomic Mass (145 vs 1 u), while Promethium (Pm) has a higher Melting Point (1,315 vs 14 K).
Atomic Properties
1
Atomic Number
61
1
Atomic Mass
145
1
Period
6
1
Group
3
Physical Properties
0
Density
7
14
Melting Point
1,315
20
Boiling Point
3,273
29
Molar Heat Capacity
N/A
Chemical Properties
2
Electronegativity
1
73
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).