Atomic radii of the elements (data page)
Atomic radii
Columns: number | symbol | name | empirical † | Calculated | van der Waals | Covalent (single bond) | Covalent (triple bond)
1 | H | hydrogen | 25 | 53 | 120 | 38 | no data | 2 | He | helium | no data | 31 | 140 | 32 | no data | 3 | Li | lithium | 145 | 167 | 182 | 134 | no data | 4 | Be | beryllium | 105 | 112 | 153 a | 90 | 85 | 5 | B | boron | 85 | 87 | 192 a | 82 | 73 | 6 | C | carbon | 70 | 67 | 170 | 77 | 60 | 7 | N | nitrogen | 65 | 56 | 155 | 75 | 54 | 8 | O | oxygen | 60 | 48 | 152 | 73 | 53 | 9 | F | fluorine | 50 | 42 | 147 | 71 | 53 | 10 | Ne | neon | no data | 38 | 154 | 69 | no data | 11 | Na | sodium | 180 | 190 | 227 | 154 | no data | 12 | Mg | magnesium | 150 | 145 | 173 | 130 | 127 | 13 | Al | aluminium | 125 | 118 | 184 a | 118 | 111 | 14 | Si | silicon | 110 | 111 | 210 | 111 | 102 | 15 | P | phosphorus | 100 | 98 | 180 | 106 | 94 | 16 | S | sulfur | 100 | 88 | 180 | 102 | 95 | 17 | Cl | chlorine | 100 | 79 | 175 | 99 | 93 | 18 | Ar | argon | 71 | 71 | 188 | 97 | 96 | 19 | K | potassium | 220 | 243 | 275 | 196 | no data | 20 | Ca | calcium | 180 | 194 | 231 a | 174 | 133 | 21 | Sc | scandium | 160 | 184 | 211 a | 144 | 114 | 22 | Ti | titanium | 140 | 176 | no data | 136 | 108 | 23 | V | vanadium | 135 | 171 | no data | 125 | 106 | 24 | Cr | chromium | 140 | 166 | no data | 127 | 103 | 25 | Mn | manganese | 140 | 161 | no data | 139 | 103 | 26 | Fe | iron | 140 | 156 | no data | 125 | 102 | 27 | Co | cobalt | 135 | 152 | no data | 126 | 96 | 28 | Ni | nickel | 135 | 149 | 163 | 121 | 101 | 29 | Cu | copper | 135 | 145 | 140 | 138 | 120 | 30 | Zn | zinc | 135 | 142 | 139 | 131 | no data | 31 | Ga | gallium | 130 | 136 | 187 | 126 | 121 | 32 | Ge | germanium | 125 | 125 | 211 a | 122 | 114 | 33 | As | arsenic | 115 | 114 | 185 | 119 | 106 | 34 | Se | selenium | 115 | 103 | 190 | 116 | 107 | 35 | Br | bromine | 115 | 94 | 185 | 114 | 110 | 36 | Kr | krypton | no data | 88 | 202 | 110 | 108 | 37 | Rb | rubidium | 235 | 265 | 303 a | 211 | no data | 38 | Sr | strontium | 200 | 219 | 249 a | 192 | 139 | 39 | Y | yttrium | 180 | 212 | no data | 162 | 124 | 40 | Zr | zirconium | 155 | 206 | no data | 148 | 121 | 41 | Nb | niobium | 145 | 198 | no data | 137 | 116 | 42 | Mo | molybdenum | 145 | 190 | no data | 145 | 113 | 43 | Tc | technetium | 135 | 183 | no data | 156 | 110 | 44 | Ru | ruthenium | 130 | 178 | no data | 126 | 103 | 45 | Rh | rhodium | 135 | 173 | no data | 135 | 106 | 46 | Pd | palladium | 140 | 169 | 163 | 131 | 112 | 47 | Ag | silver | 160 | 165 | 172 | 153 | 137 | 48 | Cd | cadmium | 155 | 161 | 158 | 148 | no data | 49 | In | indium | 155 | 156 | 193 | 144 | 146 | 50 | Sn | tin | 145 | 145 | 217 | 141 | 132 | 51 | Sb | antimony | 145 | 133 | 206 a | 138 | 127 | 52 | Te | tellurium | 140 | 123 | 206 | 135 | 121 | 53 | I | iodine | 140 | 115 | 198 | 133 | 125 | 54 | Xe | xenon | no data | 108 | 216 | 130 | 122 | 55 | Cs | caesium | 260 | 298 | 343 a | 225 | no data | 56 | Ba | barium | 215 | 253 | 268 a | 198 | 149 | 57 | La | lanthanum | 195 | no data | no data | 169 | 139 | 58 | Ce | cerium | 185 | no data | no data | no data | 131 | 59 | Pr | praseodymium | 185 | 247 | no data | no data | 128 | 60 | Nd | neodymium | 185 | 206 | no data | no data | no data | 61 | Pm | promethium | 185 | 205 | no data | no data | no data | 62 | Sm | samarium | 185 | 238 | no data | no data | no data | 63 | Eu | europium | 185 | 231 | no data | no data | no data | 64 | Gd | gadolinium | 180 | 233 | no data | no data | 132 | 65 | Tb | terbium | 175 | 225 | no data | no data | no data | 66 | Dy | dysprosium | 175 | 228 | no data | no data | no data | 67 | Ho | holmium | 175 | no data | no data | no data | no data | 68 | Er | erbium | 175 | 226 | no data | no data | no data | 69 | Tm | thulium | 175 | 222 | no data | no data | no data | 70 | Yb | ytterbium | 175 | 222 | no data | no data | no data | 71 | Lu | lutetium | 175 | 217 | no data | 160 | 131 | 72 | Hf | hafnium | 155 | 208 | no data | 150 | 122 | 73 | Ta | tantalum | 145 | 200 | no data | 138 | 119 | 74 | W | tungsten | 135 | 193 | no data | 146 | 115 | 75 | Re | rhenium | 135 | 188 | no data | 159 | 110 | 76 | Os | osmium | 130 | 185 | no data | 128 | 109 | 77 | Ir | iridium | 135 | 180 | no data | 137 | 107 | 78 | Pt | platinum | 135 | 177 | 175 | 128 | 110 | 79 | Au | gold | 135 | 174 | 166 | 144 | 123 | 80 | Hg | mercury | 150 | 171 | 155 | 149 | no data | 81 | Tl | thallium | 190 | 156 | 196 | 148 | 150 | 82 | Pb | lead | 180 | 154 | 202 | 147 | 137 | 83 | Bi | bismuth | 160 | 143 | 207 a | 146 | 135 | 84 | Po | polonium | 190 | 135 | 197 a | no data | 129 | 85 | At | astatine | no data | no data | 202 a | no data | 138 | 86 | Rn | radon | no data | 120 | 220 a | 145 | 133 | 87 | Fr | francium | no data | no data | 348 a | no data | no data | 88 | Ra | radium | 215 | no data | 283 a | no data | 159 | 89 | Ac | actinium | 195 | no data | no data | no data | 140 | 90 | Th | thorium | 180 | no data | no data | no data | 136 | 91 | Pa | protactinium | 180 | no data | no data | no data | 129 | 92 | U | uranium | 175 | no data | 186 | no data | 118 | 93 | Np | neptunium | 175 | no data | no data | no data | 116 | 94 | Pu | plutonium | 175 | no data | no data | no data | no data | 95 | Am | americium | 175 | no data | no data | no data | no data | 96 | Cm | curium | no data | no data | no data | no data | no data | 97 | Bk | berkelium | no data | no data | no data | no data | no data | 98 | Cf | californium | no data | no data | no data | no data | no data | 99 | Es | einsteinium | no data | no data | no data | no data | no data | 100 | Fm | fermium | no data | no data | no data | no data | no data | 101 | Md | mendelevium | no data | no data | no data | no data | no data | 102 | No | nobelium | no data | no data | no data | no data | no data | 103 | Lr | lawrencium | no data | no data | no data | no data | no data | 104 | Rf | rutherfordium | no data | no data | no data | no data | 131 | 105 | Db | dubnium | no data | no data | no data | no data | 126 | 106 | Sg | seaborgium | no data | no data | no data | no data | 121 | 107 | Bh | bohrium | no data | no data | no data | no data | 119 | 108 | Hs | hassium | no data | no data | no data | no data | 118 | 109 | Mt | meitnerium | no data | no data | no data | no data | 113 | 110 | Ds | darmstadtium | no data | no data | no data | no data | 112 | 111 | Rg | roentgenium | no data | no data | no data | no data | 118 | 112 | Cn | copernicium | no data | no data | no data | no data | 130 | 113 | Uut | ununtrium | no data | no data | no data | no data | no data | 114 | Fl | flerovium | no data | no data | no data | no data | no data | 115 | Uup | ununpentium | no data | no data | no data | no data | no data | 116 | Lv | livermorium | no data | no data | no data | no data | no data | 117 | Uus | ununseptium | no data | no data | no data | no data | no data | 118 | Uuo | ununoctium | no data | no data | no data | no data | no data