Arsenic (As)vsThallium (Tl)
Thallium (Tl) has a higher Atomic Mass (204 vs 75 u), while Thallium (Tl) has a higher Atomic Number (81 vs 33), while Arsenic (As) has a higher Electron Affinity (78 vs 36 kJ/mol).
Atomic Properties
33
Atomic Number
81
75
Atomic Mass
204
4
Period
6
15
Group
13
Physical Properties
6
Density
12
N/A
Melting Point
577
N/A
Boiling Point
1,746
25
Molar Heat Capacity
26
Chemical Properties
2
Electronegativity
2
78
Electron Affinity
36
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Data sourced from Periodic-Table-JSON (CC-BY-SA (data is public domain scientific fact)).