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| # | Species | Formula |
| 6254 | Xenon tetroxide | O4Xe | |
| 6255 | Xenon tetroxide (Geo) | O4Xe | |
| 6256 | Xenon fluoride, anion (Geo) | FXe | |
| 6257 | Xenon tetrafluoride (Geo) | F4Xe | |
| 6258 | Xenon tetrafluoride | F4Xe | |
| 6259 | Xenon sodium, cation (Geo) | NaXe | |
| 6260 | Xenon chloride, anion (Geo) | ClXe | |
| 6261 | Xenon potassium, cation (Geo) | KXe | |
| 6262 | Xenon bromide, anion (Geo) | BrXe | |
| 6263 | Xenon iodide, anion (Geo) | IXe | |
| 6264 | Cesium, cation | Cs | |
| 6265 | Cesium, 2P(u) - 6s(0)6p(1) | Cs | |
| 6266 | Cesium, 2S(g) - 6s(1)6p(0) | Cs | |
| 6267 | Cesium, atom | Cs | |
| 6268 | Cesium, anion | Cs | |
| 6269 | Methyl cesium (Geo) | CH3Cs | |
| 6270 | Methyl cesium | CH3Cs | |
| 6271 | Cesium cyclopentadienide (Geo) | C5H5Cs | |
| 6272 | Cesium oxide (CsO) | OCs | |
| 6273 | Cesium hydroxide | HOCs | |
| 6274 | Cesium hydroxide (Geo) | HOCs | |
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