Input interpretation
![iron(II) cation | ion class](../image_source/2c3c22f70fcf9105aa6860aa3af61c3f.png)
iron(II) cation | ion class
Result
![biomolecule ions | cations | d block ions | group 8 ions | iron(II) ions | monatomic cations | transition metal ions (total: 7)](../image_source/06081df225e5f08d518382fe2f004c24.png)
biomolecule ions | cations | d block ions | group 8 ions | iron(II) ions | monatomic cations | transition metal ions (total: 7)
Ionic radii
![| 2-coordinate | 4-coordinate biomolecule ions | 57.5 pm (median) 46 pm (copper(I) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 60 pm (median) 26 pm (chromium(VI) cation) (lowest) 137 pm (potassium cation) (highest) cations | 57.5 pm (median) 46 pm (copper(I) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 61.5 pm (median) 39 pm (aluminum cation) (lowest) 137 pm (potassium cation) (highest) d block ions | 57.5 pm (median) 46 pm (copper(I) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 59.5 pm (median) 25 pm (manganese(VII) cation) (lowest) 100 pm (silver(I) cation) (highest) group 8 ions | | 39 pm (median) 36 pm (ruthenium(VIII) cation) (lowest) 63 pm (iron(II) cation) (highest) iron(II) ions | | 63 pm (median) 63 pm (iron(II) cation) (lowest) 63 pm (iron(II) cation) (highest) monatomic cations | 57.5 pm (median) 46 pm (copper(I) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 60 pm (median) 27 pm (beryllium cation) (lowest) 137 pm (potassium cation) (highest) transition metal ions | 69 pm (median) 69 pm (mercury(II) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 60 pm (median) 36 pm (vanadium(V) cation) (lowest) 100 pm (silver(I) cation) (highest) | 5-coordinate | 6-coordinate biomolecule ions | 49.5 pm (median) 48 pm (aluminum cation) (lowest) 51 pm (tungsten(VI) cation) (highest) | 84.5 pm (median) 44 pm (chromium(VI) cation) (lowest) 220 pm (iodide anion) (highest) cations | 48 pm (median) 48 pm (aluminum cation) (lowest) 48 pm (aluminum cation) (highest) | 73 pm (median) 54 pm (aluminum cation) (lowest) 138 pm (potassium cation) (highest) d block ions | | 72 pm (median) 55 pm (iron(III) cation) (lowest) 115 pm (silver(I) cation) (highest) group 8 ions | | 59.5 pm (median) 55 pm (iron(III) cation) (lowest) 68 pm (ruthenium(III) cation) (highest) iron(II) ions | | 61 pm (median) 61 pm (iron(II) cation) (lowest) 61 pm (iron(II) cation) (highest) monatomic cations | 48 pm (median) 48 pm (aluminum cation) (lowest) 48 pm (aluminum cation) (highest) | 77 pm (median) 45 pm (beryllium cation) (lowest) 167 pm (cesium cation) (highest) transition metal ions | 46 pm (median) 46 pm (vanadium(V) cation) (lowest) 46 pm (vanadium(V) cation) (highest) | 69 pm (median) 53 pm (manganese(IV) cation) (lowest) 115 pm (silver(I) cation) (highest) | 8-coordinate | 9-coordinate | 10-coordinate biomolecule ions | 113 pm (median) 78 pm (iron(III) cation) (lowest) 174 pm (cesium cation) (highest) | 124 pm (median) 124 pm (sodium cation) (lowest) 124 pm (sodium cation) (highest) | 153 pm (median) 123 pm (calcium cation) (lowest) 181 pm (cesium cation) (highest) cations | 112 pm (median) 78 pm (iron(III) cation) (lowest) 151 pm (potassium cation) (highest) | 124 pm (median) 124 pm (sodium cation) (lowest) 124 pm (sodium cation) (highest) | 131.5 pm (median) 123 pm (calcium cation) (lowest) 140 pm (lead(II) cation) (highest) d block ions | 87 pm (median) 74 pm (titanium(IV) cation) (lowest) 128 pm (silver(I) cation) (highest) | 89 pm (median) 89 pm (zirconium(IV) cation) (lowest) 89 pm (zirconium(IV) cation) (highest) | group 8 ions | 85 pm (median) 78 pm (iron(III) cation) (lowest) 92 pm (iron(II) cation) (highest) | | iron(II) ions | 92 pm (median) 92 pm (iron(II) cation) (lowest) 92 pm (iron(II) cation) (highest) | | monatomic cations | 113 pm (median) 78 pm (iron(III) cation) (lowest) 174 pm (cesium cation) (highest) | 124 pm (median) 124 pm (sodium cation) (lowest) 124 pm (sodium cation) (highest) | 136 pm (median) 123 pm (calcium cation) (lowest) 181 pm (cesium cation) (highest) transition metal ions | 91 pm (median) 74 pm (titanium(IV) cation) (lowest) 128 pm (silver(I) cation) (highest) | | | 12-coordinate | thermochemical radius biomolecule ions | 161 pm (median) 131 pm (cadmium cation) (lowest) 188 pm (cesium cation) (highest) | 191 pm (median) 133 pm (hydroxide anion) (lowest) 258 pm (sulfate anion) (highest) cations | 144 pm (median) 134 pm (calcium cation) (lowest) 164 pm (potassium cation) (highest) | 137 pm (median) 137 pm (ammonium cation) (lowest) 137 pm (ammonium cation) (highest) d block ions | 131 pm (median) 131 pm (cadmium cation) (lowest) 131 pm (cadmium cation) (highest) | iron(II) ions | | 263 pm (median) 263 pm (hexaammineiron(II) cation) (lowest) 263 pm (hexaammineiron(II) cation) (highest) monatomic cations | 152.5 pm (median) 134 pm (calcium cation) (lowest) 188 pm (cesium cation) (highest) | transition metal ions | 131 pm (median) 131 pm (cadmium cation) (lowest) 131 pm (cadmium cation) (highest) |](../image_source/001937c1bce2e6d5c2cfe5a865da1a42.png)
| 2-coordinate | 4-coordinate biomolecule ions | 57.5 pm (median) 46 pm (copper(I) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 60 pm (median) 26 pm (chromium(VI) cation) (lowest) 137 pm (potassium cation) (highest) cations | 57.5 pm (median) 46 pm (copper(I) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 61.5 pm (median) 39 pm (aluminum cation) (lowest) 137 pm (potassium cation) (highest) d block ions | 57.5 pm (median) 46 pm (copper(I) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 59.5 pm (median) 25 pm (manganese(VII) cation) (lowest) 100 pm (silver(I) cation) (highest) group 8 ions | | 39 pm (median) 36 pm (ruthenium(VIII) cation) (lowest) 63 pm (iron(II) cation) (highest) iron(II) ions | | 63 pm (median) 63 pm (iron(II) cation) (lowest) 63 pm (iron(II) cation) (highest) monatomic cations | 57.5 pm (median) 46 pm (copper(I) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 60 pm (median) 27 pm (beryllium cation) (lowest) 137 pm (potassium cation) (highest) transition metal ions | 69 pm (median) 69 pm (mercury(II) cation) (lowest) 69 pm (mercury(II) cation) (highest) | 60 pm (median) 36 pm (vanadium(V) cation) (lowest) 100 pm (silver(I) cation) (highest) | 5-coordinate | 6-coordinate biomolecule ions | 49.5 pm (median) 48 pm (aluminum cation) (lowest) 51 pm (tungsten(VI) cation) (highest) | 84.5 pm (median) 44 pm (chromium(VI) cation) (lowest) 220 pm (iodide anion) (highest) cations | 48 pm (median) 48 pm (aluminum cation) (lowest) 48 pm (aluminum cation) (highest) | 73 pm (median) 54 pm (aluminum cation) (lowest) 138 pm (potassium cation) (highest) d block ions | | 72 pm (median) 55 pm (iron(III) cation) (lowest) 115 pm (silver(I) cation) (highest) group 8 ions | | 59.5 pm (median) 55 pm (iron(III) cation) (lowest) 68 pm (ruthenium(III) cation) (highest) iron(II) ions | | 61 pm (median) 61 pm (iron(II) cation) (lowest) 61 pm (iron(II) cation) (highest) monatomic cations | 48 pm (median) 48 pm (aluminum cation) (lowest) 48 pm (aluminum cation) (highest) | 77 pm (median) 45 pm (beryllium cation) (lowest) 167 pm (cesium cation) (highest) transition metal ions | 46 pm (median) 46 pm (vanadium(V) cation) (lowest) 46 pm (vanadium(V) cation) (highest) | 69 pm (median) 53 pm (manganese(IV) cation) (lowest) 115 pm (silver(I) cation) (highest) | 8-coordinate | 9-coordinate | 10-coordinate biomolecule ions | 113 pm (median) 78 pm (iron(III) cation) (lowest) 174 pm (cesium cation) (highest) | 124 pm (median) 124 pm (sodium cation) (lowest) 124 pm (sodium cation) (highest) | 153 pm (median) 123 pm (calcium cation) (lowest) 181 pm (cesium cation) (highest) cations | 112 pm (median) 78 pm (iron(III) cation) (lowest) 151 pm (potassium cation) (highest) | 124 pm (median) 124 pm (sodium cation) (lowest) 124 pm (sodium cation) (highest) | 131.5 pm (median) 123 pm (calcium cation) (lowest) 140 pm (lead(II) cation) (highest) d block ions | 87 pm (median) 74 pm (titanium(IV) cation) (lowest) 128 pm (silver(I) cation) (highest) | 89 pm (median) 89 pm (zirconium(IV) cation) (lowest) 89 pm (zirconium(IV) cation) (highest) | group 8 ions | 85 pm (median) 78 pm (iron(III) cation) (lowest) 92 pm (iron(II) cation) (highest) | | iron(II) ions | 92 pm (median) 92 pm (iron(II) cation) (lowest) 92 pm (iron(II) cation) (highest) | | monatomic cations | 113 pm (median) 78 pm (iron(III) cation) (lowest) 174 pm (cesium cation) (highest) | 124 pm (median) 124 pm (sodium cation) (lowest) 124 pm (sodium cation) (highest) | 136 pm (median) 123 pm (calcium cation) (lowest) 181 pm (cesium cation) (highest) transition metal ions | 91 pm (median) 74 pm (titanium(IV) cation) (lowest) 128 pm (silver(I) cation) (highest) | | | 12-coordinate | thermochemical radius biomolecule ions | 161 pm (median) 131 pm (cadmium cation) (lowest) 188 pm (cesium cation) (highest) | 191 pm (median) 133 pm (hydroxide anion) (lowest) 258 pm (sulfate anion) (highest) cations | 144 pm (median) 134 pm (calcium cation) (lowest) 164 pm (potassium cation) (highest) | 137 pm (median) 137 pm (ammonium cation) (lowest) 137 pm (ammonium cation) (highest) d block ions | 131 pm (median) 131 pm (cadmium cation) (lowest) 131 pm (cadmium cation) (highest) | iron(II) ions | | 263 pm (median) 263 pm (hexaammineiron(II) cation) (lowest) 263 pm (hexaammineiron(II) cation) (highest) monatomic cations | 152.5 pm (median) 134 pm (calcium cation) (lowest) 188 pm (cesium cation) (highest) | transition metal ions | 131 pm (median) 131 pm (cadmium cation) (lowest) 131 pm (cadmium cation) (highest) |