Editing Curium (section)

===Halides===
The colorless curium(III) fluoride (CmF<sub>3</sub>) can be made by adding fluoride ions into curium(III)-containing solutions. The brown tetravalent curium(IV) fluoride (CmF<sub>4</sub>) on the other hand is only obtained by reacting curium(III) fluoride with molecular [[fluorine]]:<ref name = "Morrs" />
: <math>\mathrm{2\ CmF_3\ +\ F_2\ \longrightarrow\ 2\ CmF_4}</math>

A series of ternary fluorides are known of the form A<sub>7</sub>Cm<sub>6</sub>F<sub>31</sub> (A = [[alkali metal]]).<ref>{{cite journal|last1=Keenan|first1=T.|title=Lattice constants of K7Cm6F31 trends in the 1:1 and 7:6 alkali metal-actinide(IV) series|journal=Inorganic and Nuclear Chemistry Letters|volume=3|issue=10|page=391|date=1967|doi=10.1016/0020-1650(67)80092-8}}</ref>

The colorless [[curium(III) chloride]] (CmCl<sub>3</sub>) is made by reacting [[curium hydroxide]] (Cm(OH)<sub>3</sub>) with anhydrous [[hydrogen chloride]] gas. It can be further turned into other halides such as curium(III) bromide (colorless to light green) and [[curium(III) iodide]] (colorless), by reacting it with the [[ammonia]] salt of the corresponding halide at temperatures of ~400–450&nbsp;°C:<ref>{{cite journal|title=Crystal Structures of the Trifluorides, Trichlorides, Tribromides, and Triiodides of Americium and Curium|last1=Asprey|first1=L. B.|last2=Keenan|first2=T. K.|last3=Kruse|first3=F. H.|journal=Inorganic Chemistry|volume=4|issue=7|page=985|date=1965|doi=10.1021/ic50029a013|s2cid=96551460 |url=https://digital.library.unt.edu/ark:/67531/metadc1035960/}}</ref>
: <math>\mathrm{CmCl_3\ +\ 3\ NH_4I\ \longrightarrow \ CmI_3\ +\ 3\ NH_4Cl}</math>

Or, one can heat curium oxide to ~600°C with the corresponding acid (such as [[hydrobromic acid|hydrobromic]] for curium bromide).<ref>{{cite journal|last1=Burns|first1=J.|title=Crystallographic studies of some transuranic trihalides: 239PuCl3, 244CmBr3, 249BkBr3 and 249CfBr3|journal=Journal of Inorganic and Nuclear Chemistry|volume=37|issue=3|page=743|date=1975|doi=10.1016/0022-1902(75)80532-X|last2=Peterson|first2=J. R.|last3=Stevenson|first3=J. N.}}</ref><ref>{{cite journal|last1=Wallmann|first1=J.|title=Crystal structure and lattice parameters of curium trichloride|journal=Journal of Inorganic and Nuclear Chemistry|volume=29|issue=11|page=2745|date=1967|doi=10.1016/0022-1902(67)80013-7|last2=Fuger|first2=J.|last3=Peterson|first3=J. R.|last4=Green|first4=J. L.|s2cid=97334114 }}</ref> Vapor phase [[hydrolysis]] of curium(III) chloride gives curium oxychloride:<ref>{{cite journal|last1=Weigel|first1=F.|last2=Wishnevsky|first2=V.|last3=Hauske|first3=H.|title=The vapor phase hydrolysis of PuCl3 and CmCl3: heats of formation of PuOC1 and CmOCl|journal=Journal of the Less Common Metals|volume=56|issue=1|page=113|date=1977|doi=10.1016/0022-5088(77)90224-7}}</ref>
: <math>\mathrm{CmCl_3\ +\ \ H_2O\ \longrightarrow \ CmOCl\ +\ 2\ HCl}</math>