# Covalent radius of each element in Angstroem from CSD (binding is: [Rcov(A)+Rcov(B)-t,Rcov(A)+Rcov(B)+t] with t = 0.4A #Element Name Symbol Period Group Block Atomic Number AtomicWeight Covalent Radius vdW Radius Hydrogen H 1 1 s 1 1.008 0.23 1.09 Helium He 1 18 p 2 4.003 1.5 1.4 Lithium Li 2 1 s 3 6.941 0.68 1.82 Beryllium Be 2 2 s 4 9.012 0.35 2 Boron B 2 13 p 5 10.811 0.83 2 Carbon C 2 14 p 6 12.011 0.68 1.7 Nitrogen N 2 15 p 7 14.007 0.68 1.55 Oxygen O 2 16 p 8 15.999 0.68 1.52 Fluorine F 2 17 p 9 18.998 0.64 1.47 Neon Ne 2 18 p 10 20.18 1.5 1.54 Sodium Na 3 1 s 11 22.991 0.97 2.27 Magnesium Mg 3 2 s 12 24.305 1.1 1.73 Aluminium Al 3 13 p 13 26.982 1.35 2 Silicon Si 3 14 p 14 28.086 1.2 2.1 Phosphorus P 3 15 p 15 30.974 1.05 1.8 Sulphur S 3 16 p 16 32.066 1.02 1.8 Chlorine Cl 3 17 p 17 35.453 0.99 1.75 Argon Ar 3 18 p 18 39.948 1.51 1.88 Potassium K 4 1 s 19 39.098 1.33 2.75 Calcium Ca 4 2 s 20 40.078 0.99 2 Scandium Sc 4 3 d 21 44.956 1.44 2 Titanium Ti 4 4 d 22 47.867 1.47 2 Vanadium V 4 5 d 23 50.942 1.33 2 Chromium Cr 4 6 d 24 51.996 1.35 2 Manganese Mn 4 7 d 25 54.938 1.35 2 Iron Fe 4 8 d 26 55.845 1.34 2 Cobalt Co 4 9 d 27 58.933 1.33 2 Nickel Ni 4 10 d 28 58.693 1.5 1.63 Copper Cu 4 11 d 29 63.546 1.52 1.4 Zinc Zn 4 12 d 30 65.39 1.45 1.39 Gallium Ga 4 13 p 31 69.723 1.22 1.87 Germanium Ge 4 14 p 32 72.61 1.17 2 Arsenic As 4 15 p 33 74.922 1.21 1.85 Selenium Se 4 16 p 34 78.96 1.22 1.9 Bromine Br 4 17 p 35 79.904 1.21 1.85 Krypton Kr 4 18 p 36 83.8 1.5 2.02 Rubidium Rb 5 1 s 37 85.468 1.47 2 Strontium Sr 5 2 s 38 87.62 1.12 2 Yttrium Y 5 3 d 39 88.906 1.78 2 Zirconium Zr 5 4 d 40 91.224 1.56 2 Niobium Nb 5 5 d 41 92.906 1.48 2 Molybdenum Mo 5 6 d 42 95.94 1.47 2 Technetium Tc 5 7 d 43 98 1.35 2 Ruthenium Ru 5 8 d 44 101.07 1.4 2 Rhodium Rh 5 9 d 45 102.906 1.45 2 Palladium Pd 5 10 d 46 106.42 1.5 1.63 Silver Ag 5 11 d 47 107.868 1.59 1.72 Cadmium Cd 5 12 d 48 112.411 1.69 1.58 Indium In 5 13 p 49 114.818 1.63 1.93 Tin Sn 5 14 p 50 118.71 1.46 2.17 Antimony Sb 5 15 p 51 121.76 1.46 2 Tellurium Te 5 16 p 52 127.6 1.47 2.06 Iodine I 5 17 p 53 126.904 1.4 1.98 Xenon Xe 5 18 p 54 131.29 1.5 2.16 Caesium Cs 6 1 s 55 132.905 1.67 2 Barium Ba 6 2 s 56 137.327 1.34 2 Lanthanum La 6Lan 19 f 57 138.906 1.87 2 Cerium Ce 6Lan 19 f 58 140.116 1.83 2 Praseodymium Pr 6Lan 19 f 59 140.908 1.82 2 Neodymium Nd 6Lan 19 f 60 144.24 1.81 2 Promethium Pm 6Lan 19 f 61 145 1.8 2 Samarium Sm 6Lan 19 f 62 150.36 1.8 2 Europium Eu 6Lan 19 f 63 151.964 1.99 2 Gadolinium Gd 6Lan 19 f 64 157.25 1.79 2 Terbium Tb 6Lan 19 f 65 158.925 1.76 2 Dysprosium Dy 6Lan 19 f 66 162.5 1.75 2 Holmium Ho 6Lan 19 f 67 164.93 1.74 2 Erbium Er 6Lan 19 f 68 167.26 1.73 2 Thulium Tm 6Lan 19 f 69 168.934 1.72 2 Ytterbium Yb 6Lan 19 f 70 173.04 1.94 2 Lutetium Lu 6 3 d 71 174.967 1.72 2 Hafnium Hf 6 4 d 72 178.49 1.57 2 Tantalum Ta 6 5 d 73 180.948 1.43 2 Tungsten W 6 6 d 74 183.84 1.37 2 Rhenium Re 6 7 d 75 186.207 1.35 2 Osmium Os 6 8 d 76 190.23 1.37 2 Iridium Ir 6 9 d 77 192.217 1.32 2 Platinum Pt 6 10 d 78 195.078 1.5 1.72 Gold Au 6 11 d 79 196.967 1.5 1.66 Mercury Hg 6 12 d 80 200.59 1.7 1.55 Thallium Tl 6 13 p 81 204.383 1.55 1.96 Lead Pb 6 14 p 82 207.2 1.54 2.02 Bismuth Bi 6 15 p 83 208.98 1.54 2 Polonium Po 6 16 p 84 210 1.68 2 Astatine At 6 17 p 85 210 1.21 2 Radon Rn 6 18 p 86 222 1.5 2 Francium Fr 7 1 s 87 223 1.5 2 Radium Ra 7 2 s 88 226 1.9 2 Actinium Ac 7Act 20 f 89 227 1.88 2 Thorium Th 7Act 20 f 90 232.038 1.79 2 Protactinium Pa 7Act 20 f 91 231.036 1.61 2 Uranium U 7Act 20 f 92 238.029 1.58 1.86 Neptunium Np 7Act 20 f 93 237 1.55 2 Plutonium Pu 7Act 20 f 94 244 1.53 2 Americium Am 7Act 20 f 95 243 1.51 2 Curium Cm 7Act 20 f 96 247 0.99 2 Berkelium Bk 7Act 20 f 97 247 1.54 2 Californium Cf 7Act 20 f 98 251 1.83 2 Einsteinium Es 7Act 20 f 99 252 1.5 2 Fermium Fm 7Act 20 f 100 257 1.5 2 Mendelevium Md 7Act 20 f 101 258 1.5 2 Nobelium No 7Act 20 f 102 259 1.5 2 Lawrencium Lr 7 3 d 103 262 1.5 2 Rutherfordium Rf 7 4 d 104 261 1.5 2 Dubnium Db 7 5 d 105 262 1.5 2 Seaborgium Sg 7 6 d 106 266 1.5 2 Bohrium Bh 7 7 d 107 264 1.5 2 Hassium Hs 7 8 d 108 269 1.5 2 Meitnerium Mt 7 9 d 109 268 1.5 2 Darmstadtium Ds 7 10 d 110 271 1.5 2