Use covalent radii (Table 9.4) to estimate the length of the P—F bond in phosphorus trifluoride, PF₃.

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Table 9.4 Single-Bond Covalent Radii Atomic Covalent Atomic Covalent Number Symbol Name Radius (pm) Number Symbol Name Radius (pm) H. Hydrogen 31 44 Ru Ruthenium 146 Не Helium 28 45 Rh Rhodium 142 3 Li Lithium 128 46 Pd Palladium 139 Be Веryllium 96 47 Ag Silver 145 B Вогоn 84 48 Cd Cadmium 144 6. Carbon 76 49 In Indium 142 7 Nitrogen 71 50 Sn Tin 139 8 Охудеn 66 51 Sb Antimony 139 9 F Fluorine 57 52 Te Tellurium 138 10 Ne Neon 58 53 Iodine 139 11 Na Sodium 166 54 Xe Xenon 140 12 Mg Magnesium 141 55 Cs Cesium 244 13 Al Aluminum 121 56 Ba Barium 215 14 Si Silicon 111 57 La Lanthanum 207 15 P. Phosphorus 107 58 Ce Cerium 204 16 Sulfur 105 59 Pr Praseodymium 203 17 CI Chlorine 102 60 Nd Neodymium 201 18 Ar Argon 106 61 Pm Promethium 199 19 K Potassium 203 62 Sm Samarium 198 20 Ca Calcium 176 63 Eu Europium 198 21 Sc Scandium 170 64 Gd Gadolinium 196 22 Ti Titanium 160 65 Tb Terbium 194 23 V Vanadium 153 66 Dy Dysprosium 192 24 Cr Chromium 139 67 Но Holmium 192 25 Mn Manganese 139 68 Er Erbium 189 26 Fe Iron 132 69 Tm Thulium 190 27 Co Cobalt 126 70 Yb Ytterbium 187 28 Ni Nickel 124 71 Lu Lutetium 187 29 Cu Соpper 132 72 Hf Hafnium 175 30 Zn Zine 122 73 Ta Tantalum 170 31 Ga Gallium 122 74 Tungsten 162 32 Ge Germanium 120 75 Re Rhenium 151 33 As Arsenic 119 76 Os Osmium 144 34 Se Selenium 120 77 Ir Iridium 141 35 Br Bromine 120 78 Pt Platinum 136 36 Kr Кгуpton 116 79 Au Gold 136 37 Rb Rubidium 220 80 Hg Mercury 132 38 Sr Strontium 195 81 TI Thallium 145 39 Y Yttrium 190 82 Pb Lead 146 40 Zr Zirconium 175 83 Bi Bismuth 148 41 Nb Niobium 164 84 Po Polonium 140 42 Mo Molybdenum 14 85 At Astatine 150 43 Te Technetium 147 86 Rn Radon 150