Thallium
Thallium
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Thallium ΒΆ
AtomicNumber: 81
Element: Thallium
Symbol: Tl
AtomicMass: 204.383
NumberofNeutrons: 123
NumberofProtons: 81
NumberofElectrons: 81
Period: 6
Group: 13.0
Phase: solid
Radioactive: nan
Natural: yes
Metal: yes
Nonmetal: nan
Metalloid: nan
Type: Metal
AtomicRadius: 2.1
Electronegativity: 2.04
FirstIonization: 6.1082
Density: 11.9
MeltingPoint: 577.15
BoilingPoint: 1746.0
NumberOfIsotopes: 28.0
Discoverer: Crookes
Year: 1861.0
SpecificHeat: 0.129
NumberofShells: 6
NumberofValence: 3.0