Metallic, Covalent and Ionic Radii(r)*

Atom/Ionr(pm)
Ag 144
Ag+ 115
Al 143(140)
Al3+ 53
Ar (95)
As (122)
As3+ 58
Au 144
Au+ 137
B (90)
Ba 224
Ba2+ 135
Be 112(125)
Be2+ 45
Bi 182
Bi3+ 103
Br 114
Br- 196
C (77)
Ca 197
Ca2+ 100
Cd 152
Cd2+ 95
Ce 182
Atom/Ionr(pm)
Ce3+ 102
Cl (99)
Cl- 184
Co 125
Co2+ 70
Co3+ 60
Cr 129
Cr3+ 62
Cs 272
Cs+ 167
Cu 128
Cu+ 77
Cu2+ 73
F (71)
F- 133
Fe 126
Fe2+ 70
Fe3+ 60
Ga 153
Ga3+ 62
Ge 139(122)
H (37)
He (32)
Hf 159
Atom/Ionr(pm)
Hg 155
Hg2+ 102
I (133)
I- 220
In 167
In3+ 80
Ir 136
Ir3+ 82
K 235
K+ 138
Kr (110)
La 188
La3+ 103
Li 157
Li+ 76
Lu 172
Lu3+ 86
Mg 160
Mg2+ 72
Mn 137
Mn2+ 70
N (75)
Na 191
Na+ 102
Ne (69)
Atom/Ionr(pm)
Ni 125
Ni2+ 70
O (73)
O2- 140
Os 135
P (110)
Pb 175
Pb2+ 119
Pd 137
Pd2+ 86
Po 153
Pt 139
Pt2+ 80
Pt4+ 77
Rb 250
Rb+ 152
Rh 134
Rn (145)
Ru 134
S (102)
S2- 184
Sb 161(143)
Sb3+ 76
Sc 164
Sc3+ 75
Atom/Ionr(pm)
Se (117)
Se2- 198
Si (118)
Sn 158(140)
Sn2+ 118
Sr 215
Sr2+ 118
Te (135)
Te2- 221
Th 180
Ti 147
Ti3+ 67
Tl 171
Tl+ 150
Tl3+ 88
U 156
V 135
V2+ 79
W 141
Xe (130)
Y 182
Y3+ 90
Zn 137
Zn2+ 74
Zr 160

*1 Å = 100pm

*Metallic radii for 12-coordination are given for all metals. Covalent radii are in parentheses. Ionic radii are for six-coordination.

Reference: A.F. Wells, "Structural Inorganic Chemistry," 5th ed., Clarendon Press, Oxford, 1984, p. 1288 (metallic radii for 12-coordination); Huheey, pp. 292 (covalent radii for nonmetals); R.D. Shannon, Acta Crystallogr., Sect. A: Found. Crystallogr., 32, 751 (1976) (ionic radii for 6-coordination).