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Reference.org
Trifluoride
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<p>Trifluorides are compounds in which one atom or ion has three fluorine atoms or ions associated. Many metals form trifluorides, such as iron, the <a href="/facts/Rare-earth_element/PQSUQumk">rare-earth elements</a>, and the metals in the groups <a href="/facts/Group_3_element/q60AHJ7U">3</a>, <a href="/facts/Boron_group/RXnvqnNk">13</a> and <a href="/facts/Pnictogen/jX4hvCkK">15</a> of the periodic table. Most metal trifluorides are poorly soluble in water except <a href="/facts/Ferric_fluoride/Rfs9cKXr">ferric fluoride</a> and <a href="/facts/Indium(III)_fluoride/lYJ7yJyq">indium(III) fluoride</a>, but several are soluble in other solvents. </p>