Ion

Charge

Coordination

Spin State

Crystal Radius

Ionic Radius

Key*

Ac3VI 1.261.12R
Ag1II 0.810.67 
IV 1.141C
IVSQ 1.161.02 
V 1.231.09C
VI 1.291.15C
VII 1.361.22 
VIII 1.421.28 
2IVSQ 0.930.79 
VI 1.080.94 
3IVSQ 0.810.67 
VI 0.890.75R
Al3IV 0.530.39*
V 0.620.48 
VI 0.6750.535R*
Am2VII 1.351.21 
VIII 1.41.26 
IX 1.451.31 
3VI 1.1150.975R
VIII 1.231.09 
4VI 0.990.85R
VIII 1.090.95 
As3VI 0.720.58A
5IV 0.4750.335R*
VI 0.60.46C*
At7VI 0.760.62A
Au1VI 1.511.37A
3IVSQ 0.820.68 
VI 0.990.85A
5VI 0.710.57 
B3III 0.150.01*
IV 0.250.11*
VI 0.410.27C
Ba2VI 1.491.35 
VII 1.521.38C
VIII 1.561.42 
IX 1.611.47 
X 1.661.52 
XI 1.711.57 
XII 1.751.61C
Be2III 0.30.16 
IV 0.410.27*
VI 0.590.45C
Bi3V 1.10.96C
VI 1.171.03R*
VIII 1.311.17R
5VI 0.90.76E
Bk3VI 1.10.96R
4VI 0.970.83R
VIII 1.070.93R
Br-1VI 1.821.96P
3IVSQ 0.730.59 
5IIIPY 0.450.31 
7IV 0.390.25 
VI 0.530.39A
C4III 0.06-0.08 
IV 0.290.15P
VI 0.30.16A
Ca2VI 1.141 
VII 1.21.06*
VIII 1.261.12*
IX 1.321.18 
X 1.371.23C
XII 1.481.34C
Cd2IV 0.920.78 
V 1.010.87 
VI 1.090.95 
VII 1.171.03C
VIII 1.241.1C
XII 1.451.31 
Ce3VI 1.151.01R
VII 1.211.07E
VIII 1.2831.143R
IX 1.3361.196R
X 1.391.25 
XII 1.481.34C
4VI 1.010.87R
VIII 1.110.97R
X 1.211.07 
XII 1.281.14 
Cf3VI 1.090.95R
4VI 0.9610.821R
VIII 1.060.92 
Cl-1VI 1.671.81P
5IIIPY 0.260.12 
7IV 0.220.08*
VI 0.410.27A
Cm3VI 1.110.97R
4VI 0.990.85R
VIII 1.090.95R
Co2IVHigh Spin0.720.58 
V 0.810.67C
VILow Spin0.790.65R
High Spin0.8850.745R*
VIII 1.040.9 
3VILow Spin0.6850.545R*
High Spin0.750.61 
4IV 0.540.4 
VIHigh Spin0.670.53R
Cr2VILow Spin0.870.73E
High Spin0.940.8R*
3VI 0.7550.615R*
4IV 0.550.41 
VI 0.690.55R
5IV 0.4850.345R
VI 0.630.49ER
VIII 0.710.57 
6IV 0.40.26 
VI 0.580.44C
Cs1VI 1.811.67 
VIII 1.881.74 
IX 1.921.78 
X 1.951.81 
XI 1.991.85 
XII 2.021.88 
Cu1II 0.60.46 
IV 0.740.6E
VI 0.910.77E
2IV 0.710.57 
IVSQ 0.710.57*
V 0.790.65*
VI 0.870.73 
3VILow Spin0.680.54 
D1II 0.04-0.1 
Dy2VI 1.211.07 
VII 1.271.13 
VIII 1.331.19 
3VI 1.0520.912R
VII 1.110.97 
VIII 1.1671.027R
IX 1.2231.083R
Er3VI 1.030.89R
VII 1.0850.945 
VIII 1.1441.004R
IX 1.2021.062R
Eu2VI 1.311.17 
VII 1.341.2 
VIII 1.391.25 
IX 1.441.3 
X 1.491.35 
3VI 1.0870.947R
VII 1.151.01 
VIII 1.2061.066R
IX 1.261.12R
F-1II 1.1451.285 
III 1.161.3 
IV 1.171.31 
VI 1.191.33 
7VI 0.220.08A
Fe2IVHigh Spin0.770.63 
IVSQHigh Spin0.780.64 
VIHigh Spin0.920.78R*
Low Spin0.750.61E
VIIIHigh Spin1.060.92C
3IVHigh Spin0.630.49*
V 0.720.58 
VILow Spin0.690.55R
High Spin0.7850.645R*
VIIIHigh Spin0.920.78 
4VI 0.7250.585R
6IV 0.390.25R
Fr1VI 1.941.8A
Ga3IV 0.610.47*
V 0.690.55 
VI 0.760.62R*
Gd3VI 1.0780.938R
VII 1.141 
VIII 1.1931.053R
IX 1.2471.107RC
Ge2VI 0.870.73A
4IV 0.530.39*
VI 0.670.53R*
H1I -0.24-0.38 
II -0.04-0.18 
Hf4IV 0.720.58R
VI 0.850.71R
VII 0.90.76 
VIII 0.970.83 
Hg1III 1.110.97 
VI 1.331.19 
2II 0.830.69 
IV 1.10.96 
VI 1.161.02 
VIII 1.281.14R
Ho3VI 1.0410.901R
VIII 1.1551.015R
IX 1.2121.072R
X 1.261.12 
I-1VI 2.062.2A
5IIIPY 0.580.44*
VI 1.090.95 
7IV 0.560.42 
VI 0.670.53 
In3IV 0.760.62 
VI 0.940.8R*
VIII 1.060.92RC
Ir3VI 0.820.68E
4VI 0.7650.625R
5VI 0.710.57EM
K1IV 1.511.37 
VI 1.521.38 
VII 1.61.46 
VIII 1.651.51 
IX 1.691.55 
X 1.731.59 
XII 1.781.64 
La3VI 1.1721.032R
VII 1.241.1 
VIII 1.31.16R
IX 1.3561.216R
X 1.411.27 
XII 1.51.36C
Li1IV 0.730.59*
VI 0.90.76*
VIII 1.060.92C
Lu3VI 1.0010.861R
VIII 1.1170.977R
IX 1.1721.032R
Mg2IV 0.710.57 
V 0.80.66 
VI 0.860.72*
VIII 1.030.89C
Mn2IVHigh Spin0.80.66 
VHigh Spin0.890.75C
VILow Spin0.810.67E
High Spin0.970.83R*
VIIHigh Spin1.040.9C
VIII 1.10.96R
3V 0.720.58 
VILow Spin0.720.58R
High Spin0.7850.645R*
4IV 0.530.39R
VI 0.670.53R*
5IV 0.470.33R
6IV 0.3950.255 
7IV 0.390.25 
VI 0.60.46A
Mo3VI 0.830.69E
4VI 0.790.65RM
5IV 0.60.46R
VI 0.750.61R
6IV 0.550.41R*
V 0.640.5 
VI 0.730.59R*
VII 0.870.73 
N-3IV 1.321.46 
3VI 0.30.16A
5III 0.044-0.104 
VI 0.270.13A
Na1IV 1.130.99 
V 1.141 
VI 1.161.02 
VII 1.261.12 
VIII 1.321.18 
IX 1.381.24C
XII 1.531.39 
Nb3VI 0.860.72 
4VI 0.820.68RE
VIII 0.930.79 
5IV 0.620.48C
VI 0.780.64 
VII 0.830.69C
VIII 0.880.74 
Nd2VIII 1.431.29 
IX 1.491.35 
3VI 1.1230.983R
VIII 1.2491.109R*
IX 1.3031.163R
XII 1.411.27E
Ni2IV 0.690.55 
IVSQ 0.630.49 
V 0.770.63E
VI 0.830.69R*
3VIHigh Spin0.740.6E
Low Spin0.70.56R*
4VILow Spin0.620.48R
No2VI 1.241.1E
Np2VI 1.241.1 
3VI 1.151.01R
4VI 1.010.87R
VIII 1.120.98R
5VI 0.890.75 
6VI 0.860.72R
7VI 0.850.71A
O-2II 1.211.35 
III 1.221.36 
IV 1.241.38 
VI 1.261.4 
VIII 1.281.42 
OH-1II 1.181.32 
III 1.21.34 
IV 1.211.35E
VI 1.231.37E
Os4VI 0.770.63RM
5VI 0.7150.575E
6V 0.630.49 
VI 0.6850.545E
7VI 0.6650.525E
8IV 0.530.39 
P3VI 0.580.44A
5IV 0.310.17*
V 0.430.29 
VI 0.520.38C
Pa3VI 1.181.04E
4VI 1.040.9R
VIII 1.151.01 
5VI 0.920.78 
VIII 1.050.91 
IX 1.090.95 
Pb2IVPY 1.120.98C
VI 1.331.19 
VII 1.371.23C
VIII 1.431.29C
IX 1.491.35C
X 1.541.4C
XI 1.591.45C
XII 1.631.49 
4IV 0.790.65E
V 0.870.73E
VI 0.9150.775R
VIII 1.080.94R
Pd1II 0.730.59 
2IVSQ 0.780.64 
VI 10.86 
3VI 0.90.76 
4VI 0.7550.615R
Pm3VI 1.110.97R
VIII 1.2331.093R
IX 1.2841.144R
Po4VI 1.080.94R
VIII 1.221.08R
6VI 0.810.67A
Pr3VI 1.130.99R
VIII 1.2661.126R
IX 1.3191.179R
4VI 0.990.85R
VIII 1.10.96R
Pt2IVSQ 0.740.6 
VI 0.940.8A
4VI 0.7650.625R
5VI 0.710.57ER
Pu3VI 1.141R
4VI 10.86R
VIII 1.10.96 
5VI 0.880.74E
6VI 0.850.71R
Ra2VIII 1.621.48R
XII 1.841.7R
Rb1VI 1.661.52 
VII 1.71.56 
VIII 1.751.61 
IX 1.771.63E
X 1.81.66 
XI 1.831.69 
XII 1.861.72 
XIV 1.971.83 
Re4VI 0.770.63RM
5VI 0.720.58E
6VI 0.690.55E
7IV 0.520.38 
VI 0.670.53 
Rh3VI 0.8050.665R
4VI 0.740.6RM
5VI 0.690.55 
Ru3VI 0.820.68 
4VI 0.760.62RM
5VI 0.7050.565ER
7IV 0.520.38 
8IV 0.50.36 
S-2VI 1.71.84P
4VI 0.510.37A
6IV 0.260.12*
VI 0.430.29C
Sb3IVPY 0.90.76 
V 0.940.8 
VI 0.90.76A
5VI 0.740.6*
Sc3VI 0.8850.745R*
VIII 1.010.87R*
Se-2VI 1.841.98P
4VI 0.640.5A
6IV 0.420.28*
VI 0.560.42C
Si4IV 0.40.26*
VI 0.540.4R*
Sm2VII 1.361.22 
VIII 1.411.27 
IX 1.461.32 
3VI 1.0980.958R
VII 1.161.02E
VIII 1.2191.079R
IX 1.2721.132R
XII 1.381.24C
Sn4IV 0.690.55R
V 0.760.62C
VI 0.830.69R*
VII 0.890.75 
VIII 0.950.81C
Sr2VI 1.321.18 
VII 1.351.21 
VIII 1.41.26 
IX 1.451.31 
X 1.51.36C
XII 1.581.44C
Ta3VI 0.860.72E
4VI 0.820.68E
5VI 0.780.64 
VII 0.830.69 
VIII 0.880.74 
Tb3VI 1.0630.923R
VII 1.120.98E
VIII 1.181.04R
IX 1.2351.095R
4VI 0.90.76R
VIII 1.020.88 
Tc4VI 0.7850.645RM
5VI 0.740.6ER
7IV 0.510.37 
VI 0.70.56A
Te-2VI 2.072.21P
4III 0.660.52 
IV 0.80.66 
VI 1.110.97 
6IV 0.570.43C
VI 0.70.56*
Th4VI 1.080.94C
VIII 1.191.05RC
IX 1.231.09*
X 1.271.13E
XI 1.321.18C
XII 1.351.21C
Ti2VI 10.86E
3VI 0.810.67R*
4IV 0.560.42C
V 0.650.51C
VI 0.7450.605R*
VIII 0.880.74C
Tl1VI 1.641.5R
VIII 1.731.59R
XII 1.841.7RE
3IV 0.890.75 
VI 1.0250.885R
VIII 1.120.98C
Tm2VI 1.171.03 
VII 1.231.09 
3VI 1.020.88R
VIII 1.1340.994R
IX 1.1921.052R
U3VI 1.1651.025R
4VI 1.030.89 
VII 1.090.95E
VIII 1.141R*
IX 1.191.05 
XII 1.311.17E
5VI 0.90.76 
VII 0.980.84E
6II 0.590.45 
IV 0.660.52 
VI 0.870.73*
VII 0.950.81E
VIII 10.86 
V2VI 0.930.79 
3VI 0.780.64R*
4V 0.670.53 
VI 0.720.58R*
VIII 0.860.72E
5IV 0.4950.355R*
V 0.60.46*
VI 0.680.54 
W4VI 0.80.66RM
5VI 0.760.62R
6IV 0.560.42*
V 0.650.51 
VI 0.740.6*
Xe8IV 0.540.4 
VI 0.620.48 
Y3VI 1.040.9R*
VII 1.10.96 
VIII 1.1591.019R*
IX 1.2151.075R
Yb2VI 1.161.02 
VII 1.221.08E
VIII 1.281.14 
3VI 1.0080.868R*
VII 1.0650.925E
VIII 1.1250.985R
IX 1.1821.042R
Zn2IV 0.740.6*
V 0.820.68*
VI 0.880.74R*
VIII 1.040.9C
Zr4IV 0.730.59R
V 0.80.66C
VI 0.860.72R*
VII 0.920.78*
VIII 0.980.84*
IX 1.030.89 
Radii are in Angstrom

*Notes Regarding Key.
R, From r3 vs V plots.
C, Calculated from bond length - bond strength equations.
E, Estimated.
?, Doubtful.
*, Most Reliable.
M, From Metallic Oxides.
A, Ahrens (1952) Ionic radius.1
P, Pauling's (1960) Crystal Radius.2

All data presented here has been taken from "Revised Effective Ionic Radii and Systematic Studies of Interatomic Distances in Halides and Chalcogenides" By R. D. Shannon. Central Research and Development Department, Experimental Station, E. I. Du Pont de Nemours and Company, Wilmington, Delaware 19898, U.S.A.
Published in Acta Crystallographica. (1976). A32, Pages 751-767.

1L. H. Ahrens. Published in 1952 Geochim. Cosmochim. Acta, 2, Pages 155-169.

2"The Nature of the Chemical Bond" L. Pauling. Published in 1961 by Ithaca: Cornell University Press.


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