Ionic radius

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Ionic radius is a concept for expressing the sizes of ions in ionic crystals. The ionic radius is estimated from the distance between cations and anions that are adjacent in ion crystals. It is assumed that the internuclear distance between two ions in the ionic structure is equal to the sum of the radius of those ions, though the ionic radius is not actually constant because it depends on the ionic valency, the coordination number, and the state of spin of the ion. Assuming the radius of 140 picometers for the ion of O2−, the average value of the radius of other ions was set from the distance between ions that were measured for many oxides and from the difference from the radius of O2−. Generally, the ionic radius of the negative ion becomes large and that of the positive ion becomes small compared with the former neutral atom. Ionic radius also refers to the size of an atom after losing all valence electrons (the outer electron shell).

Table of Elements Sorted by Ionic Radius
Ionic Radius Name Sym #
0.012 Å 1.2 pm Hydrogen H 1
0.13 Å 13 pm Nitrogen N 7
0.23 Å 23 pm Boron B 5
0.35 Å 35 pm Beryllium Be 4
0.38 Å 38 pm Phosphorus P 15
0.4 Å 40 pm Silicon Si 14
0.46 Å 46 pm Manganese Mn 25
0.5 Å 50 pm Selenium Se 34
0.52 Å 52 pm Uranium U 92
0.52 Å 52 pm Chromium Cr 24
0.53 Å 53 pm Germanium Ge 32
0.535 Å 53.5 pm Aluminum Al 13
0.56 Å 56 pm Rhenium Re 75
0.56 Å 56 pm Technetium Tc 43
0.58 Å 58 pm Arsenic As 33
0.59 Å 59 pm Vanadium V 23
0.605 Å 60.5 pm Titanium Ti 22
0.62 Å 62 pm Tungsten W 74
0.62 Å 62 pm Gallium Ga 31
0.625 Å 62.5 pm Platinum Pt 78
0.625 Å 62.5 pm Iridium Ir 77
0.63 Å 73 pm Osmium Os 76
0.64 Å 64 pm Tantalum Ta 73
0.645 Å 64.5 pm Iron Fe 26
0.65 Å 65 pm Molybdenum Mo 42
0.68 Å 68 pm Rhodium Rh 45
0.68 Å 68 pm Ruthenium Ru 44
0.69 Å 69 pm Nickel Ni 28
0.69 Å 69 pm Niobium Nb 41
0.69 Å 69 pm Tin Sn 50
0.71 Å 71 pm Hafnium Hf 72
0.72 Å 72 pm Zirconium Zr 40
0.72 Å 72 pm Magnesium Mg 12
0.73 Å 73 pm Copper Cu 29
0.74 Å 74 pm Zinc Zn 30
0.745 Å 74.5 pm Cobalt Co 27
0.745 Å 74.5 pm Scandium Sc 21
0.75 Å 75 pm Neptunium Np 93
0.76 Å 76 pm Lithium Li 3
0.76 Å 76 pm Antimony Sb 51
0.78 Å 78 pm Protactinium Pa 91
0.8 Å 80 pm Indium In 49
0.848 Å 84.8 pm Lutetium Lu 71
0.85 Å 85 pm Gold Au 79
0.858 Å 85.8 pm Ytterbium Yb 70
0.86 Å 86 pm Palladium Pd 46
0.869 Å 86.9 pm Thulium Tm 69
0.881 Å 88.1 pm Erbium Er 68
0.887 Å 88.7 pm Plutonium Pu 94
0.9 Å 90 pm Yttrium Y 39
0.901 Å 90.1 pm Holmium Ho 67
0.912 Å 91.2 pm Dysprosium Dy 66
0.923 Å 92.3 pm Terbium Tb 65
0.925 Å 92.5 pm Einsteinium Es 99
0.934 Å 93.4 pm Californium Cf 98
0.938 Å 93.8 pm Gadolinium Gd 64
0.947 Å 94.7 pm Europium Eu 63
0.949 Å 94.9 pm Berkelium Bk 97
0.964 Å 96.4 pm Samarium Sm 62
0.97 Å 97 pm Curium Cm 96
0.97 Å 97 pm Tellurium Te 52
0.97 Å 97 pm Cadmium Cd 48
0.972 Å 97.2 pm Thorium Th 90
0.979 Å 97.9 pm Promethium Pm 61
0.982 Å 98.2 pm Americium Am 95
0.99 Å 99 pm Calcium Ca 20
0.995 Å 99.5 pm Neodymium Nd 60
1.013 Å 101.3 pm Praseodymium Pr 59
1.02 Å 102 pm Mercury Hg 80
1.02 Å 102 pm Sodium Na 11
1.03 Å 103 pm Bismuth Bi 83
1.034 Å 103.4 pm Cerium Ce 58
1.061 Å 106.1 pm Lanthanum La 57
1.1 Å 110 pm Nobelium No 102
1.119 Å 111.9 pm Actinium Ac 89
1.12 Å 112 pm Strontium Sr 38
1.19 Å 119 pm Lead Pb 82
1.26 Å 126 pm Silver Ag 47
1.33 Å 133 pm Fluorine F 9
1.35 Å 135 pm Barium Ba 56
1.38 Å 138 pm Potassium K 19
1.4 Å 140 pm Oxygen O 8
1.43 Å 143 pm Radium Ra 88
1.5 Å 150 pm Thallium Tl 81
1.52 Å 152 pm Rubidium Rb 37
1.67 Å 167 pm Cesium Cs 55
1.8 Å 180 pm Francium Fr 87
1.81 Å 181 pm Chlorine Cl 17
1.84 Å 184 pm Sulfur S 16
1.96 Å 196 pm Bromine Br 35
2.2 Å 220 pm Iodine I 53
2.3 Å 230 pm Polonium Po 84
Table of Ionic Radii Sorted by Atomic Number
Ionic Radius Name Sym #
0.012 Å 1.2 pm Hydrogen H 1
0.76 Å 76 pm Lithium Li 3
0.35 Å 35 pm Beryllium Be 4
0.23 Å 23 pm Boron B 5
0.13 Å 13 pm Nitrogen N 7
1.4 Å 140 pm Oxygen O 8
1.33 Å 133 pm Fluorine F 9
1.02 Å 102 pm Sodium Na 11
0.72 Å 72 pm Magnesium Mg 12
0.535 Å 53.5 pm Aluminum Al 13
0.4 Å 40 pm Silicon Si 14
0.38 Å 38 pm Phosphorus P 15
1.84 Å 184 pm Sulfur S 16
1.81 Å 181 pm Chlorine Cl 17
1.38 Å 138 pm Potassium K 19
0.99 Å 99 pm Calcium Ca 20
0.745 Å 74.5 pm Scandium Sc 21
0.605 Å 60.5 pm Titanium Ti 22
0.59 Å 59 pm Vanadium V 23
0.52 Å 52 pm Chromium Cr 24
0.46 Å 46 pm Manganese Mn 25
0.645 Å 64.5 pm Iron Fe 26
0.745 Å 74.5 pm Cobalt Co 27
0.69 Å 69 pm Nickel Ni 28
0.73 Å 73 pm Copper Cu 29
0.74 Å 74 pm Zinc Zn 30
0.62 Å 62 pm Gallium Ga 31
0.53 Å 53 pm Germanium Ge 32
0.58 Å 58 pm Arsenic As 33
0.5 Å 50 pm Selenium Se 34
1.96 Å 196 pm Bromine Br 35
1.52 Å 152 pm Rubidium Rb 37
1.12 Å 112 pm Strontium Sr 38
0.9 Å 90 pm Yttrium Y 39
0.72 Å 72 pm Zirconium Zr 40
0.69 Å 69 pm Niobium Nb 41
0.65 Å 65 pm Molybdenum Mo 42
0.56 Å 56 pm Technetium Tc 43
0.68 Å 68 pm Ruthenium Ru 44
0.68 Å 68 pm Rhodium Rh 45
0.86 Å 86 pm Palladium Pd 46
1.26 Å 126 pm Silver Ag 47
0.97 Å 97 pm Cadmium Cd 48
0.8 Å 80 pm Indium In 49
0.69 Å 69 pm Tin Sn 50
0.76 Å 76 pm Antimony Sb 51
0.97 Å 97 pm Tellurium Te 52
2.2 Å 220 pm Iodine I 53
1.67 Å 167 pm Cesium Cs 55
1.35 Å 135 pm Barium Ba 56
1.061 Å 106.1 pm Lanthanum La 57
1.034 Å 103.4 pm Cerium Ce 58
1.013 Å 101.3 pm Praseodymium Pr 59
0.995 Å 99.5 pm Neodymium Nd 60
0.979 Å 97.9 pm Promethium Pm 61
0.964 Å 96.4 pm Samarium Sm 62
0.947 Å 94.7 pm Europium Eu 63
0.938 Å 93.8 pm Gadolinium Gd 64
0.923 Å 92.3 pm Terbium Tb 65
0.912 Å 91.2 pm Dysprosium Dy 66
0.901 Å 90.1 pm Holmium Ho 67
0.881 Å 88.1 pm Erbium Er 68
0.869 Å 86.9 pm Thulium Tm 69
0.858 Å 85.8 pm Ytterbium Yb 70
0.848 Å 84.8 pm Lutetium Lu 71
0.71 Å 71 pm Hafnium Hf 72
0.64 Å 64 pm Tantalum Ta 73
0.62 Å 62 pm Tungsten W 74
0.56 Å 56 pm Rhenium Re 75
0.63 Å 73 pm Osmium Os 76
0.625 Å 62.5 pm Iridium Ir 77
0.625 Å 62.5 pm Platinum Pt 78
0.85 Å 85 pm Gold Au 79
1.02 Å 102 pm Mercury Hg 80
1.5 Å 150 pm Thallium Tl 81
1.19 Å 119 pm Lead Pb 82
1.03 Å 103 pm Bismuth Bi 83
2.3 Å 230 pm Polonium Po 84
1.8 Å 180 pm Francium Fr 87
1.43 Å 143 pm Radium Ra 88
1.119 Å 111.9 pm Actinium Ac 89
0.972 Å 97.2 pm Thorium Th 90
0.78 Å 78 pm Protactinium Pa 91
0.52 Å 52 pm Uranium U 92
0.75 Å 75 pm Neptunium Np 93
0.887 Å 88.7 pm Plutonium Pu 94
0.982 Å 98.2 pm Americium Am 95
0.97 Å 97 pm Curium Cm 96
0.949 Å 94.9 pm Berkelium Bk 97
0.934 Å 93.4 pm Californium Cf 98
0.925 Å 92.5 pm Einsteinium Es 99
1.1 Å 110 pm Nobelium No 102

[edit] See also

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