Thallium Tl
Electron 1
Electron 2
Electron 1
Electron 2
Electron 3
Electron 4
Electron 5
Electron 6
Electron 7
Electron 8
Electron 1
Electron 2
Electron 3
Electron 4
Electron 5
Electron 6
Electron 7
Electron 8
Electron 9
Electron 10
Electron 11
Electron 12
Electron 13
Electron 14
Electron 15
Electron 16
Electron 17
Electron 18
Electron 1
Electron 2
Electron 3
Electron 4
Electron 5
Electron 6
Electron 7
Electron 8
Electron 9
Electron 10
Electron 11
Electron 12
Electron 13
Electron 14
Electron 15
Electron 16
Electron 17
Electron 18
Electron 19
Electron 20
Electron 21
Electron 22
Electron 23
Electron 24
Electron 25
Electron 26
Electron 27
Electron 28
Electron 29
Electron 30
Electron 31
Electron 32
Electron 1
Electron 2
Electron 3
Electron 4
Electron 5
Electron 6
Electron 7
Electron 8
Electron 9
Electron 10
Electron 11
Electron 12
Electron 13
Electron 14
Electron 15
Electron 16
Electron 17
Electron 18
Electron 1
Electron 2
Electron 3
Thallium is a chemical element with symbol Tl and atomic number 81. This soft gray post-transition metal is not found free in nature. When isolated, it resembles tin, but discolors when exposed to air.
81
Atomic Number
204.38 u
Atomic Mass
577.15 K
Melting Point
1746 K
Boiling Point
11.85 g/cm³
Density
2.1 Å
Atomic Radius
1.45 Å
Covalent Radius
2.04
Electronegativity
6.11 eV
First Ionization Energy
36.4
Electron Affinity
6
Number of Shells
3
Electron Valency
2, 8, 18, 32, 18, 3
Electron Shell Occupations
0.13 J/g
Specific Heat