ISISISISISISISISISISISISISISISISISISISIS

The Institute for Surface Structures: Research & Development Division


APPROXIMATE RADII OF ATOMIC NUCLEI:

Dimensions given in centimeters


Element 110Element 111
Microscopic Cross Section
Atomic Number Element/MoleculeAtomic Weight Radius Diameter d1 d2 d3 da ds
cm cm barns
1 H 1.008 1.37x10-17 2.74x10-17 .059 .118 .111 .332 38
H2O 18.015 3.59x10-17 7.18x10-17 .405 .810 .755 .664 103
D2O 20.028 3.72x10-17 7.44x10-17 .434 .869 .811 .001 13.6
2 He 4.003 2.18x10-17 4.35x10-17 .149 .297 .277 .05 .76
3 Li 6.939 2.61x10-17 5.23x10-17 .215 .429 .400 70.7 1.4
4 Be 9.012 2.85x10-17 5.70x10-17 .255 .511 .476 .009 6.14
5 B 10.811 3.03x10-17 6.06x10-17 .288 .577 .537 759 3.6
6 C 12.011 3.14x10-17 6.27x10-17 .309 .619 .577 .003 4.75
7 N 14.007 3.30x10-17 6.60x10-17 .343 .685 .639 1.85 10.6
8 0 15.999 3.45x10-17 6.60x10-17 .374 .749 .698 27 3.76
9 F 18.998 3.66x10-17 7.31x10-17 .420 .840 .783 .009 4.0
10 Ne 20.183 3.73x10-17 7.46x10-17 .437 .874 .815 .038 2.42
11 Na 23.000 3.89x10-17 7.79x10-17 .477 .953 .889 .530 3.2
12 Mg 24.312 3.98x10-17 7.94x10-17 .495 .989 .923 .063 3.42
13 Al 26.982 4.11x10-17 8.22x10-17 .530 1.06 .989 .230 1.49
14 Si 28.086 4.16x10-17 8.33x10-17 .545 1.08 1.02 .16 2.2
15 P 30.974 4.30x10-17 8.60x10-17 .581 1.16 1.08 .180 5
16 S 32.064 4.35x10-17 8.70x10-17 .595 1.19 1.11 .52 . 98
17 Cl 35.453 4.50x10-17 9.00x10-17 .636 1.27 1.18 33.2 16
18 Ar 39.948 4.68x10-17 9.36x10-17 .689 1.37 1.28 .678 .64
19 K 39.4102 4.65x10-17 9.30x10-17 .679 1.35 1.26 2.10 1.5
20 Ca 40.08 4.68x10-17 9.37xl10-17 .690 1.38 1.28 .43 3
21 Sc 44.956 4.87xl10-17 9.74x10-17 .745 1.49 1.39 26.5 24
Microscopic Cross Section
Atomic Number Element/MoleculeAtomic Weight Radius Diameter d1 d2 d3 da ds
cm cm barns
22 Ti 47.90 4.97x10-17 .95x10-17 .777 1.55 .145 6.1 4.0
23 V 50.942 5.07x,10-17 1.01x10-16 .810 1.62 1.51 5.04 4.9
24 Cr 51.996 5.11x10-17 1.02x10-16 .821 1.64 1.53 3.1 3.8
25 Mn 54.938 5.20x10-17 1.04x10-16 .852 1.70 1.58 13.3 2.1
26 Fe 55.847 5.23x10-17 1.04x10-16 .861 1.72 1.60 2.55 10.9
27 Co 58.933 5.33x10-17 1.06x10-16 .892 1.78 1.66 37.2 6.7
28 Ni 58.71 5.32x10-17 1.06x10-16 .890 1.78 1.66 4.43 17.3
29 Cu 63.54 5.46x10-17 1.09x10-16 .938 1.87 1.75 3.79 7.9
30 Zn 65.37 5.51x10-17 1.10x10-16 .956 1.91 1.78 1.10 4.2
31 Ga 69.72 5.63x10-17 1.12x10-16 .999 1.99 1.86 2.9 6.5
32 Ge 72.59 5.71x10-17 1.14x10-16 1.02 2.05 1.91 2.3 7.5
33 As 74.922 5.77x10-17 1.15x10-16 1.04 1.09 1.95 4.3 7
34 Se 78.96 5.87x10-17 1.17x10-16 1.08 2.17 2.02 11.7 9.7
35 Br 79.909 5.90x10-17 1.18x10-16 1.09 2.18 2.04 6.8 6.1
36 Kr 83.80 5.99x10-17 1.19x10-16 1.12 2.25 2.10 25 7.5
37 Rb 85.47 6.03x10-17 1.02x10-16 1.14 2.28 2.13 .37 6.2
38 Sr 87.62 6.08x10-17 1.21x10-16 1.16 2.32 2.17 1.21 10
39 Y 88.905 6.11x10-17 1.22x10-16 1.17 2.34 2.19 1.28 7.6
40 Zr 91.22 6.16x10-17 1.23x10-16 1.19 2.38 2.22 .185 6.4
41 Nb 92.906 6.20x10-17 1.24x10-16 1.20 2.41 2.25 1.15 5
42 Mo 95.94 6.27x10-17 1.25x10-16 1.23 2.47 2.30 2.65 5.8
Microscopic Cross Section
Atomic Number Element/MoleculeAtomic Weight Radius Diameter d1 d2 d3 da ds
cm cm barns
43 Tc 99 6.33x10-17 1.26x10-16 1.26 2.52 2.35 19 -
44 Ru 101.07 6.38x10-17 1.27x10-16 1.27 2.55 2.38 2.56 6
45 Rh 102.905 6.41x10-17 1.28x10-16 1.29 2.58 2.41 150 5
46 Pd 106.4 6.49x10-17 1.29x10-16 1.32 2.64 2.46 6.9 5.0
47 Ag 107.87 6.52x10-17 1.30x10-16 1.33 2.67 2.49 63.6 6
48 Cd 112.40 6.61x10-17 1.32x10-16 1.37 2.74 2.56 2450 5.6
49 In 114.82 6.65x10-17 1.33x10-16 1.39 2.78 2.59 194 2
50 Sn 118.69 6.73x10-17 1.34x10-16 1.42 2.82 2.65 .63 4
51 Sb 121.75 6.79x10-17 1.35x10-16 1.44 2.89 2.70 5.4 4.2
52 Te 127.60 6.89x10-17 1.37x10-16 1.49 2.98 2.78 4.7 5
53 I 126.904 6.88xlo-17 1.37x10-16 1.48 2.97 2.77 6.2 4
54 Xe 131.30 6.96x10-17 1.39x10-16 1.52 3.04 2.84 24.5 4.30
55 Cs 132.905 6.99x10-17 1.39x10-16 1.53 3.07 2.86 29 20
56 Ba 137.34 7.06x10-17 1.41x10-16 1.56 3.13 2.92 1.2 8
57 La 138.91 7.09x10-17 1.41x10-16 1.58 3.16 2.95 9.0 9.3
58 Ce 140.12 7.11x10-17 1.42x10-16 1.59 3.18 2.96 .63 4.7
59 Pr 140.91 7.12x10-17 1.42x10-16 1.59 3.19 2.97 11.5 3.3
60 Nd 144.24 7.18x10-17 1.43x10-16 1.62 3.24 3.0 50.5 16
61 Pm 145 7.lgx10-17 1.43x10-16 1.62 3.25 3.03 60 -
62 Sm 150.35 7.28x10-17 1.45x10-16 1.66 3.33 3.11 5800 5
63 Eu 151.96 7.31x10-17 1.46x10-16 1.67 3.35 3.13 4600 8
Microscopic Cross Section
Atomic Number Element/MoleculeAtomic Weight Radius Diameter d1 d2 d3 da ds
cm cm barns
64 Gd 157.25 7.39x10-17 1.47x10-16 1.71 3.43 3.20 49000 -
65 Tb 158.93 7.42x10-17 1.48x10-16 1.73 3.46 3.22 25.5 20
66 Dy 162.50 7.47x10-17 1.49x10-16 1.75 3.51 3.27 930 100
67 Ho 164.93 7.51x10-17 1.50x10-16 1.77 3.54 3.30 66.5 9.4
68 Er 167.26 7.54x10-17 1.50x10-16 1.78 3.57 3.33 162 11.0
69 Tm 168.93 7.57x10-17 1.51xl10-16 1.80 3.60 3.36 103 12
70 Yb 173.04 76.3x10-17 1.52x10-16 1.83 3.66 3.41 36.6 25
71 Lu 174.97 7.66x10-17 1.53x10-16 1.84 3.68 3.44 77 8
72 Hf 178.49 7.71x10-17 1.54x10-16 1.86 3.73 3.48 102 8
73 Ta 180.95 7.74x10-17 1.54x10-16 1.88 3.77 3.51 21 6.2
74 W 183.85 7.79x10-17 1.55x10-16 1.90 3.81 3.55 18.5 5
75 Re 186.2 7.82x10-17 1.56x10-16 1.92 3.84 3.58 88 11.3
76 Os 190.2 7.87x10-17 1.57x10-16 1.95 3.90 3.63 15.3 11
Microscopic Cross Section
Atomic Number Element/MoleculeAtomic Weight Radius Diameter d1 d2 d3 da ds
cm cm barns
77 Tr 192.2 7.90x10-17 1.58x10-16 1.96 3.92 3.66 426 14
78 Pt 195.09 7.94x10-17 1.58x10-16 1.98 3.96 3.7 10 11.2
79 Au 197.00 7.97x10-17 1.59x10-16 1.99 3.99 3.72 98.8 9.3
80 Hg 200.59 8.01x10-17 1.60x10-16 2.02 4.04 3.76 375 20
81 Tl 204.37 8.06x10-17 1.61x10-16 2.04 4.09 3.81 3.4 9.7
82 Pb 207.19 8.10x10-17 1.62x10-16 2.06 4.12 3.85 .17 11.4
83 Bi 208.98 8.12x10-17 1.62x10-16 2.07 4.15 3.87 .033 9
84 Po 210.05 8.14x10-17 1.62x10-16 2.08 4.16 3.88 - -
85 At 211 8.15x10-17 1.63x10-16 2.08 4.17 3.89 - -
86 Rn 222 8.29x10-17 1.65x10-16 2.16 4.32 4.03 0.7 -
87 Fr 223 8.30x10-17 1.66x10-16 2.16 4.33 4.04 - -
88 Ra 226.03 8.34x10-17 1.67x10-16 2.18 4.37 4.08 11.5 -
89 Ac 227 8.35x10-17 1.67x10-16 2.19 4.38 4.09 515 -
90 Th 232.04 8.41x10-17 1.68x10-16 2.22 4.45 4.15 7.4 12.7
91 Pa 231.04 8.40x10-17 1.68x10-16 2.22 4.44 4.14 210 -
92 U 238.03 8.49x10-17 1.69x10-16 2.26 4.52 4.22 7.53 8.9
U02 270.03 8.85x10-17 1.77x10-16 2.46 4.92 4.59 7.53 18
93 Np 237.05 8.47x10-17 1.69x10-16 2.25 4.51 4.21 169 -
94 Pu 239.13 8.50x10-17 1.70x10-16 2.27 4.54 4.23 1011 7.7
PuO 255.129 8.69x10-17 1.74x10-16 2.37 4.47 4.42 - -
Pu 240 8.51x10-17 1.70x10-16 2.27 4.55 4.24 289 -
Pu 241 8.525x10-17 1.71x10-16 2.28 4.
110
111
112Element 112
113Element 113

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Preliminary

Tables adapted from Nuclear Reactor Engineering, Third Edition

Approximate radii given in centimeters for scale comparison