Iodine (I)vsPromethium (Pm)
Iodine (I) has a higher Electron Affinity (295 vs 12 kJ/mol), while Promethium (Pm) has a higher Boiling Point (3,273 vs 457 K), while Iodine (I) has a higher Group (17 vs 3).
Atomic Properties
53
Atomic Number
61
127
Atomic Mass
145
5
Period
6
17
Group
3
Physical Properties
5
Density
7
387
Melting Point
1,315
457
Boiling Point
3,273
N/A
Molar Heat Capacity
N/A
Chemical Properties
3
Electronegativity
1
295
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).