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Thallium(I) fluoride facts for kids

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Thallium(I) fluoride
Other names Thallium monofluoride

Thallous fluoride

CAS number 7789-27-7
PubChem 62675
EC number 232-154-1
RTECS number XG4900000
Molecular formula TlF2•
Molar mass 223.3817 g/mol
Appearance White crystals
Density 8.36 g cm−3
Melting point

327 °C, 600 K, 621 °F

Boiling point

655 °C, 928 K, 1211 °F

Solubility in water 78.6 g/100 mL (at 15 °C)
Solubility slightly soluble in ethanol
−44.4·10−6 cm3/mol
Crystal structure Orthorhombic, oP8
Space group Fmmm, No. 28
EU classification Very Toxic T+ Dangerous for the Environment (Nature) N
R-phrases R26/28, R33, R51/53
S-phrases S13, S28, S45, S61
Related compounds
Other anions Thallium(I) chloride

Thallium(I) bromide
Thallium(I) iodide

Other cations Gallium(III) fluoride

Indium(III) fluoride
Thallium(III) fluoride

Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)

Thallium(I) fluoride, also known as thallous fluoride, is a chemical compound. Its chemical formula is TlF. It has thallium and fluoride ions. The thallium is in its +1 oxidation state.


Thallium(I) fluoride is a white solid. It dissolves easily in water. It also dissolves in ethanol. It absorbs a little water in wet air.


It is made by reacting thallium(I) oxide or thallium(I) carbonate with hydrofluoric acid.

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