| # | Species | Formula |
| 4909 | Mo2Cl6O2(2-) (BELWAQ) (Geo) | O2Cl6Mo2 | |
| 4910 | Mo(III)2Cl9(3-) (FAFSOU01) (Geo) | Cl9Mo2 | |
| 4911 | Mo(III)2Cl9(3-) (FAFSOU01) | Cl9Mo2 | |
| 4912 | Mo2Br6O2(2-) (BELWEU) (Geo) | O2Br6Mo2 | |
| 4913 | Mo2Br6O2(2-) (BELWEU) | O2Br6Mo2 | |
| 4914 | Mo2Br9, trianion (Geo) | Br9Mo2 | |
| 4915 | Technetium, 8P(u) state | Tc | |
| 4916 | Technetium, atom | Tc | |
| 4917 | Tc(Cp)(C6H6) | C11H11Tc | |
| 4918 | Tc(Cp)(C6H6) (Geo) | C11H11Tc | |
| 4919 | Tc(Cp)2C (VIXRAV) (Geo) | C15H19Tc | |
| 4920 | Tc(Cp)2C (VIXRAV) | C15H19Tc | |
| 4921 | Tc(II)(NH3)6 | H18N6Tc | |
| 4922 | Tc(II)(NH3)6 (Geo) | H18N6Tc | |
| 4923 | Tc(VII)N6(+) (WACSAU) (Geo) | C18H18N6Tc | |
| 4924 | Tc(VII)N6(+) (WACSAU) | C18H18N6Tc | |
| 4925 | Tc(V)N4O(-) (WACRUN) (Geo) | C12H12N4OTc | |
| 4926 | Tc(V)N4O(-) (WACRUN) | C12H12N4OTc | |
| 4927 | Tc(III)N4O2(-) (BEWRIE) (Geo) | C4H16N4O2Tc | |
| 4928 | Tc(III)N4O2(-) (BEWRIE) | C4H16N4O2Tc | |
| 4929 | Tc(V)N4O2(+) (NIPRIN) (Geo) | C6H20N4O2Tc | |