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Thallium
SEE PERIODIC TABLE
SEE FULL ARTICLE
Atomic Number
81
Atomic
Symbol
Tl
Atomic Weight
204.3833 amu
Group
Other Metals, 13
Form
Solid
Density
@
STP
11.8 g/cm
3
Melting Point
304 °C (579.2 °F, 577.15 °K)
Boiling Point
1473 °C (2683.4 °F, 1746.15 °K)
Heat of Fusion
4.14 kJ/mol
Heat of Vaporization
165 kJ/mol
First
Ionization Potential
6.10829 eV
Electronegativity
(on
Pauling scale
1.8
Specific Heat
Capacity
0.129 J/g K
Ground State
Electron Configuration
5d
10
6s
2
6p
1
Oxidation State(s)
+1, +3
Stable Isotopes
and
Natural Abundance
on Earth
203
Tl, 29.524%;
205
Tl, 70.476%
Selected
Radioisotopes
201
Tl
Atomic Radius
156 pm
Crystal Structure
Hexagonal
Discovered by
Crookes, 1861
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