Arsenic (As)vsPromethium (Pm)
Arsenic (As) has a higher Electron Affinity (78 vs 12 kJ/mol), while Arsenic (As) has a higher Group (15 vs 3), while Promethium (Pm) has a higher Atomic Mass (145 vs 75 u).
Atomic Properties
33
Atomic Number
61
75
Atomic Mass
145
4
Period
6
15
Group
3
Physical Properties
6
Density
7
N/A
Melting Point
1,315
N/A
Boiling Point
3,273
25
Molar Heat Capacity
N/A
Chemical Properties
2
Electronegativity
1
78
Electron Affinity
12
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).