81
204.38 u
Tl
Thallium
Post Transition Metal
Atomic Structure
Physical State
Group
13
Period
6
Block
p
Electron Configuration
[Xe] 4f¹⁴ 5d¹⁰ 6s² 6p¹
Physical Properties
Atomic Mass:
204.38 u
Electronegativity:
1.62
Atomic Radius:
156 pm
Ionization Energy:
6.108 eV
Density:
11.85 g/cm³
Melting Point:
577 K
Boiling Point:
1746 K
Historical Information
Discovered By:
William Crookes
Year Discovered:
1861