Astatine (At)vsNeptunium (Np)
Neptunium (Np) has a higher Boiling Point (4,447 vs 610 K), while Astatine (At) has a higher Group (17 vs 3), while Astatine (At) has a higher Electron Affinity (233 vs 46 kJ/mol).
Atomic Properties
85
Atomic Number
93
210
Atomic Mass
237
6
Period
7
17
Group
3
Physical Properties
6
Density
20
575
Melting Point
912
610
Boiling Point
4,447
N/A
Molar Heat Capacity
29
Chemical Properties
2
Electronegativity
1
233
Electron Affinity
46
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).