Helium (He)vsIodine (I)
Iodine (I) has a higher Electron Affinity (295 vs -48 kJ/mol), while Iodine (I) has a higher Melting Point (387 vs 1 K), while Iodine (I) has a higher Boiling Point (457 vs 4 K).
Atomic Properties
2
Atomic Number
53
4
Atomic Mass
127
1
Period
5
18
Group
17
Physical Properties
0
Density
5
1
Melting Point
387
4
Boiling Point
457
N/A
Molar Heat Capacity
N/A
Chemical Properties
N/A
Electronegativity
3
-48
Electron Affinity
295
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).