| # | Species | Formula |
| 3300 | Manganese(IV) oxide dichloride (Geo) | OCl2Mn | |
| 3301 | Mn(II)Cl2N4 (MUPYUR) (Geo) | C12H12N4O2Cl2Mn | |
| 3302 | Mn(II)(H2O)4Cl2(trans) | H8O4Cl2Mn | |
| 3303 | Mn(II)(H2O)4Cl2(trans) (Geo) | H8O4Cl2Mn | |
| 3304 | Mn2(Ac)4 | C8H12O8Mn2 | |
| 3305 | Mn2(Ac)4 (Geo) | C8H12O8Mn2 | |
| 3306 | Mn2(CO)9 | C9O9Mn2 | |
| 3307 | Mn2(CO)10 | C10O10Mn2 | |
| 3308 | Mn2(CO)10 (Geo) | C10O10Mn2 | |
| 3309 | Mn2(CO)10C2 (JIPVOT) (Geo) | C12O10Mn2 | |
| 3310 | Mn2(CO)8(CF2)2 (DOFPET) (Geo) | C10O8F4Mn2 | |
| 3311 | Mn(II)2Cl6O4(=) (IPRAMN01) (Geo) | H8O4Cl6Mn2 | |
| 3312 | Iron(+) 6D(g) 4s(1)3d(6) | Fe | |
| 3313 | Iron, cation | Fe | |
| 3314 | Iron, 3F(g) 3d(7)4s(1) | Fe | |
| 3315 | Iron, atom | Fe | |
| 3316 | FeH(+) (Geo) | HFe | |
| 3317 | FeH (Geo) | HFe | |
| 3318 | Fe-CH3 | CH3Fe | |
| 3319 | Fe(III)Cp2(+) (FERRIC) (Geo) | C10H10Fe | |
| 3320 | Fe(III)Cp2(+) (FERRIC) | C10H10Fe | |