Table of Atomic Radii

The following table contains some of the atomic radius data used by CrystalMaker. This is a brief summary of a far more extensive body of work – please see the notes at the end of this page for more information.

Atomic
Number
Element
Symbol
Atomic
Radius [Å]
Ionic
Radius [Å]
Covalent
Radius [Å]
Van-der-Waals
Radius [Å]
“Crystal”
Radius [Å]
1 H 0.53 0.25 0.37 1.20 0.10
2 He 0.31 0.31 0.32 1.40
3 Li 1.67 1.45 1.34 1.82 0.90
4 Be 1.12 1.05 0.90 0.41
5 B 0.87 0.85 0.82 0.25
6 C 0.67 0.70 0.77 1.70 0.29
7 N 0.56 0.65 0.75 1.55 0.30
8 O 0.48 0.60 0.73 1.52 1.21
9 F 0.42 0.50 0.71 1.47 1.19
10 Ne 0.38 0.38 0.69 1.54
11 Na 1.90 1.80 1.54 2.27 1.16
12 Mg 1.45 1.50 1.30 1.73 0.86
13 Al 1.18 1.25 1.18 0.53
14 Si 1.11 1.10 1.11 2.10 0.40
15 P 0.98 1.00 1.06 1.80 0.31
16 S 0.88 1.00 1.02 1.80 0.43
17 Cl 0.79 1.00 0.99 1.75 1.67
18 Ar 0.71 0.71 0.97 1.88
19 K 2.43 2.20 1.96 2.75 1.52
20 Ca 1.94 1.80 1.74 1.14
21 Sc 1.84 1.60 1.44 0.89
22 Ti 1.76 1.40 1.36 0.75
23 V 1.71 1.35 1.25 0.68
24 Cr 1.66 1.40 1.27 0.76
25 Mn 1.61 1.40 1.39 0.81
26 Fe 1.56 1.40 1.25 0.69
27 Co 1.52 1.35 1.26 0.54
28 Ni 1.49 1.35 1.21 1.63 0.70
29 Cu 1.45 1.35 1.38 1.40 0.71
30 Zn 1.42 1.35 1.31 1.39 0.74
31 Ga 1.36 1.30 1.26 1.87 0.76
32 Ge 1.25 1.25 1.22 0.53
33 As 1.14 1.15 1.19 1.85 0.72
34 Se 1.03 1.15 1.16 1.90 0.56
35 Br 0.94 1.15 1.14 1.85 1.82
36 Kr 0.88 0.88 1.10 2.02
37 Rb 2.65 2.35 2.11 1.66
38 Sr 2.19 2.00 1.92 1.32
39 Y 2.12 1.85 1.62 1.04
40 Zr 2.06 1.55 1.48 0.86
41 Nb 1.98 1.45 1.37 0.78
42 Mo 1.90 1.45 1.45 0.79
43 Tc 1.83 1.35 1.56 0.79
44 Ru 1.78 1.30 1.26 0.82
45 Rh 1.73 1.35 1.35 0.81
46 Pd 1.69 1.40 1.31 1.63 0.78
47 Ag 1.65 1.60 1.53 1.72 1.29
48 Cd 1.61 1.55 1.48 1.58 0.92
49 In 1.56 1.55 1.44 1.93 0.94
50 Sn 1.45 1.45 1.41 2.17 0.69
51 Sb 1.33 1.45 1.38 0.90
52 Te 1.23 1.40 1.35 2.06 1.11
53 I 1.15 1.40 1.33 1.98 2.06
54 Xe 1.08 1.08 1.30 2.16 0.62
55 Cs 2.98 2.60 2.25 1.81
56 Ba 2.53 2.15 1.98 1.49
57 La 1.95 1.95 1.69 1.36
58 Ce 1.85 1.85 1.15
59 Pr 2.47 1.85 1.32
60 Nd 2.06 1.85 1.30
61 Pm 2.05 1.85 1.28
62 Sm 2.38 1.85 1.10
63 Eu 2.31 1.85 1.31
64 Gd 2.33 1.80 1.08
65 Tb 2.25 1.75 1.18
66 Dy 2.28 1.75 1.05
67 Ho 2.26 1.75 1.04
68 Er 2.26 1.75 1.03
69 Tm 2.22 1.75 1.02
70 Yb 2.22 1.75 1.13
71 Lu 2.17 1.75 1.60 1.00
72 Hf 2.08 1.55 1.50 0.85
73 Ta 2.00 1.45 1.38 0.78
74 W 1.93 1.35 1.46 0.74
75 Re 1.88 1.35 1.59 0.77
76 Os 1.85 1.30 1.28 0.77
77 Ir 1.80 1.35 1.37 0.77
78 Pt 1.77 1.35 1.28 1.75 0.74
79 Au 1.74 1.35 1.44 1.66 1.51
80 Hg 1.71 1.50 1.49 1.55 0.83
81 Tl 1.56 1.90 1.48 1.96 1.03
82 Pb 1.54 1.80 1.47 2.02 1.49
83 Bi 1.43 1.60 1.46 1.17
84 Po 1.35 1.90 1.08
85 At 1.27 1.27 0.76
86 Rn 1.20 1.20 1.45
87 Fr 1.94
88 Ra 2.15 1.62
89 Ac 1.95 1.95 1.26
90 Th 1.80 1.80 1.19
91 Pa 1.80 1.80 1.09
92 U 1.75 1.75 1.86 0.87
93 Np 1.75 1.75
94 Pu 1.75 1.75 1.00
95 Am 1.75 1.75 1.12
96 Cm 1.11

Referances:

  1. Atomic Radii: values are calculated from:E Clementi, D L Raimondi, W P Reinhardt (1963) J Chem Phys. 38:2686.
  2. Ionic Radii: these data are taken from an empirical system of unified atomic-ionic radii, which is suitable for describing anion-cation contacts in ionic structures. The data were derived by the comparison of bond lengths in over 1200 bond types in ionic, metallic, and covalent crystals and molecules by:J C Slater (1964) J Chem Phys 41:3199

    J C Slater (1965) Quantum Theory of Molecules and Solids. Symmetry and Bonds in Crystals. Vol 2. McGraw-Hill, New York.

    Note that calculated data have been used for the following elements: He, Ne, Ar, Kr, Xe, At and Rn. These data were taken from:

    E Clementi, D L Raimondi, W P Reinhardt (1963) J Chem Phys 38:2686

  3. Covalent Radii: Data given here are taken from WebElements, copyright Mark Winter, University of Sheffield, UK.
  4. Van-der-Waals Radii: Van der Waals radii are established from contact distances between non-bonding atoms in touching molecules or atoms. Most data here are from:A Bondi (1964) J Phys Chem 68:441
  5. “Crystal” Radii: These data are taken from Shannon & Prewitt’s (S∓P) seminal work on “physical” ionic radii, as determined from measurements of real structures.R D Shannon and C T Prewitt (1969) Acta Cryst. B25:925-946

    R D Shannon (1976) Acta Cryst. A23:751-761

 

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