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A3: Covalent Radii

  • Page ID
    2182
  • The values of Table 3 show the covalent radii from the two recent original determinations by Cordero et al.[1], and Pyykkö and Atsumi [2]. The differences between the two single-bond values are often explained by the different coordination numbers in the two data bases used. When the effective radii do not follow the natural order single > double > triple, it means that the changes in the radii of the ligands are even larger than those for the considered element.

    Atomic Number Element Covalent radii
    Single Bonds [1] Single Bonds [2] Double Bonds [2] Triple Bonds [2]
    1 H 31 32 - -
    2 He 28 46 - -
    3 Li 128 133 124 -
    4 Be 96 102 90 85
    5 B 84 85 78 73
    6 C 76 75 67 60
    7 N 71 71 60 54
    8 O 66 63 57 53
    9 F 57 64 59 53
    10 Ne 58 67 96 -
    11 Na 166 155 160 -
    12 Mg 141 139 132 127
    13 Al 121 126 113 111
    14 Si 111 116 107 102
    15 P 107 111 102 94
    16 S 105 103 94 95
    17 Cl 102 99 95 93
    18 Ar 106 96 107 96
    19 K 203 196 193 -
    20 Ca 176 171 147 133
    21 Sc 170 148 116 114
    22 Ti 160 136 117 108
    23 v 153 134 112 106
    24 Cr 139 122 111 103
    25 Mn 150 119 105 103
    26 Fe 142 116 109 102
    27 Co 138 111 103 96
    28 Ni 124 110 101 101
    29 Cu 132 112 115 120
    30 Zn 122 118 120 -
    31 Ga 122 124 117 121
    32 Ge 120 121 111 114
    33 As 119 121 114 106
    34 Se 120 116 107 107
    35 Br 120 114 109 110
    36 Kr 116 117 121 108
    37 Rb 220 210 202 -
    38 Sr 195 185 157 139
    39 Y 190 163 130 124
    40 Zr 175 154 127 121
    41 Nb 164 147 125 116
    42 Mo 154 138 121 113
    43 Tc 147 128 120 110
    44 Ru 146 125 114 103
    45 Rh 142 125 110 106
    46 Pd 139 120 117 112
    47 Ag 145 128 139 137
    48 Cd 144 136 144 -
    49 In 142 142 136 146
    50 Sn 139 140 130 132
    51 Sb 139 140 133 127
    52 Te 138 136 128 121
    53 I 139 133 129 125
    54 Xe 140 131 135 122
    55 Cs 244 232 209 -
    56 Ba 215 196 161 149
    57 La 207 180 139 139
    58 Ce 204 163 137 131
    59 Pr 203 176 138 128
    60 Nd 201 174 137 -
    61 Pm 199 173 135 -
    62 Sm 198 172 134 -
    63 Eu 198 168 134 -
    64 Gd 196 169 135 132
    65 Tb 194 168 135 -
    66 Dy 192 167 133 -
    67 Ho 192 166 133 -
    68 Er 189 165 133 -
    69 Tm 190 164 131 -
    70 Yb 187 170 129 -
    71 Lu 187 162 131 131
    72 Hf 175 152 128 122
    73 Ta 170 146 126 119
    74 W 162 137 120 115
    75 Re 151 131 119 110
    76 Os 144 129 116 109
    77 Ir 141 122 115 107
    78 Pt 136 123 112 110
    79 Au 136 124 121 123
    80 Hg 132 133 142 -
    81 Tl 145 144 142 150
    82 Pb 146 144 135 137
    83 Bi 148 151 141 135
    84 Po 140 145 135 129
    85 At 150 147 138 138
    86 Rn 150 142 145 133
    87 Fr 260 223 218 -
    88 Ra 221 201 173 159
    89 Ac 215 186 153 140
    90 Th 206 175 143 136
    91 Pa 200 169 138 129
    92 U 196 170 134 118
    93 Np 190 171 136 116
    94 Pu 187 172 135 -
    95 Am 180 166 135 -
    96 Cm 169 166 136 -
    97 Bk - 168 139 -
    98 Cf - 168 140 -
    99 Es - 165 140 -
    100 Fm - 167 - -
    101 Md - 173 139 -
    102 No - 176 159 -
    103 Lr - 161 141 -
    104 Rf - 157 140 131
    105 Db - 149 136 126
    106 Sg - 143 128 121
    107 Bh - 141 128 119
    108 Hs - 134 125 118
    109 Mt - 129 125 113
    110 Ds - 128 116 112
    111 Rg - 121 116 118
    112 Cn - 122 137 130
    113 Uut - 136 - -
    114 Uuq - 143 - -
    115 Uup - 162 - -
    116 Uuh - 175 - -
    117 Uus - 165 - -
    118 Uuo - 157 - -

    References

    1. Beatriz Cordero, Verónica Gómez, Ana E. Platero-Prats, Marc Revés, Jorge Echeverría, Eduard Cremades, Flavia Barragán and Santiago Alvarez (2008). "Covalent radii revisited". Dalton Trans. (21): 2832–2838 http://dx.doi.org/10.1039/b801115j
    2. Pekka Pyykkö, Michiko Atsumi (2009). "Molecular Double-Bond Covalent Radii for Elements Li–E112". Chemistry: A European Journal 15 (46): 12770–12779. http://dx.doi.org/10.1002/chem.200901472