Ethan Charles Blocher-Smith’s favorite structure is:

CsXeF7

CsXeF7

Source: http://openmopac.net/PM7_accuracy/data_solids/Cesium_xenon_heptafluoride__CsXeF7___ICSD_404986__jmol_XRay_fs.html

Why?

Not only does this compound include an alkali metal, a halogen, and a noble gas (traditionally unexpected), but it also violates the octet rule, adopting the rarely-seen monocapped octahedron for the XeF7- anion. In addition, in the absence of solvent at 50°C it readily decays into Cs2XeF8 (stable to 400°C) and the unstable XeF6. Even a hint of water and this will decay into the highly explosive XeO3.—Ethan Charles Blocher-Smith

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