| # | Species | Formula |
| 7982 | Thallium (+++) | Tl | |
| 7983 | Thallium, dication | Tl | |
| 7984 | Thallium, cation | Tl | |
| 7985 | Thallium, atom | Tl | |
| 7986 | Tl(III)C2(+) (DMTLAZ) (Geo) | C2H6Tl | |
| 7987 | Tl(III)C2(+) (DMTLAZ) | C2H6Tl | |
| 7988 | Tl(III)C3 (TMETTL) (Geo) | C3H9Tl | |
| 7989 | Tl(III)C3 (TMETTL) | C3H9Tl | |
| 7990 | Cyclopentadienyl thallium (Geo) | C5H5Tl | |
| 7991 | Thallium cyclopentadienyl | C5H5Tl | |
| 7992 | Tl(I)N3(+) (DUCDIO) (Geo) | C9H21N3Tl | |
| 7993 | Tl(I)N3(+) (DUCDIO) | C9H21N3Tl | |
| 7994 | Tl(III)N6(3+) (BOWKIH) (Geo) | C6H24N6Tl | |
| 7995 | Tl(III)N6(3+) (BOWKIH) | C6H24N6Tl | |
| 7996 | Tl(III)N4C2(+) (LUWWIJ) (Geo) | C8H18N6Tl | |
| 7997 | Tl(III)N4C2(+) (LUWWIJ) | C8H18N6Tl | |
| 7998 | TlBO2 (Geo) | BO2Tl | |
| 7999 | Tl(III)C2O2 (MTLACA) (Geo) | C7H13O2Tl | |
| 8000 | Tl(III)C2O2 (MTLACA) | C7H13O2Tl | |
| 8001 | Thallium tris-8-quinolinol (Geo) | C27H18N3O3Tl | |
| 8002 | Thallium tris-8-quinolinol | C27H18N3O3Tl | |