Iodine (I)vsThallium (Tl)
Iodine (I) has a higher Electron Affinity (295 vs 36 kJ/mol), while Thallium (Tl) has a higher Boiling Point (1,746 vs 457 K), while Thallium (Tl) has a higher Density (12 vs 5 g/cm³).
Atomic Properties
53
Atomic Number
81
127
Atomic Mass
204
5
Period
6
17
Group
13
Physical Properties
5
Density
12
387
Melting Point
577
457
Boiling Point
1,746
N/A
Molar Heat Capacity
26
Chemical Properties
3
Electronegativity
2
295
Electron Affinity
36
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).