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| Rank | Topic | Wikipedia views Oct 21 2010 |
|---|---|---|
| 1 | Aluminium oxide – Al<sub>2</sub>O<sub>3</sub> | 19904 |
| 2 | Carbon dioxide – CO<sub>2</sub> | 18924 |
| 3 | Ammonia – NH<sub>3</sub> | 16877 |
| 4 | Sodium hydroxide – NaOH | 14016 |
| 5 | Sulfuric acid – H<sub>2</sub>SO<sub>4</sub> | 13929 |
| 6 | Hydrochloric acid – HCl | 13507 |
| 7 | Hydrogen peroxide – H<sub>2</sub>O<sub>2</sub> | 12441 |
| 8 | Sodium chloride – NaCl | 11768 |
| 9 | Carbon monoxide – CO | 8258 |
| 10 | Nitric acid – HNO<sub>3</sub> | 8038 |
| 11 | Silicon dioxide – SiO<sub>2</sub> | 7867 |
| 12 | Phosphoric acid – H<sub>3</sub>PO<sub>4</sub> | 7643 |
| 13 | Magnesium sulfate – MgSO<sub>4</sub> | 7414 |
| 14 | Sodium carbonate – Na<sub>2</sub>CO<sub>3</sub> | 7128 |
| 15 | Hydrogen sulfide – H<sub>2</sub>S | 7028 |
| 16 | Copper(II) sulfate – CuSO<sub>4</sub> | 6526 |
| 17 | Sulfur dioxide – SO<sub>2</sub> | 6110 |
| 18 | Ozone – O<sub>3</sub> | 5853 |
| 19 | Potassium nitrate – KNO<sub>3</sub> | 5705 |
| 20 | Potassium chloride – KCl | 5305 |
| 21 | Calcium chloride – CaCl<sub>2</sub> | 4967 |
| 22 | Potassium permanganate – KMnO<sub>4</sub> | 4841 |
| 23 | Borax – Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>·10H<sub>2</sub>O | 4738 |
| 24 | Sodium sulfate – Na<sub>2</sub>SO<sub>4</sub> | 4652 |
| 25 | Silver nitrate – AgNO<sub>3</sub> | 4632 |
| 26 | Titanium dioxide (titanium(IV) oxide) – TiO<sub>2</sub> | 4125 |
| 27 | Potassium hydroxide – KOH | 3988 |
| 28 | Carbonic acid – H<sub>2</sub>CO<sub>3</sub> | 3958 |
| 29 | Calcium hydroxide – Ca(OH)<sub>2</sub> | 3930 |
| 30 | Boric acid – H<sub>3</sub>BO<sub>3</sub> | 3874 |
| 31 | Ammonium nitrate – NH<sub>4</sub>NO<sub>3</sub> | 3523 |
| 32 | Iron(III) oxide – Fe<sub>2</sub>O<sub>3</sub> | 3503 |
| 33 | Ammonium chloride – NH<sub>4</sub>Cl | 3450 |
| 34 | Magnesium oxide – MgO | 3406 |
| 35 | Nitrogen dioxide – NO<sub>2</sub> | 3316 |
| 36 | Sodium nitrate – NaNO<sub>3</sub> | 3274 |
| 37 | Silica gel – SiO<sub>2</sub>·nH<sub>2</sub>O | 3060 |
| 38 | Zinc oxide – ZnO | 3052 |
| 39 | Iron(III) chloride – FeCl<sub>3</sub> | 3007 |
| 40 | Carbon tetrachloride – CCl<sub>4</sub> | 2882 |
| 41 | Potassium iodide – KI | 2861 |
| 42 | Hydrogen chloride – HCl | 2854 |
| 43 | Magnesium chloride – MgCl<sub>2</sub> | 2671 |
| 44 | Hydrazine – N<sub>2</sub>H<sub>4</sub> | 2575 |
| 45 | Aluminium chloride – AlCl<sub>3</sub> | 2410 |
| 46 | Ammonium hydroxide – NH<sub>4</sub>OH | 2367 |
| 47 | Ammonium sulfate – (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub> | 2359 |
| 48 | Copper(II) chloride – CuCl<sub>2</sub> | 2332 |
| 49 | Hypochlorous acid – HClO | 2216 |
| 50 | Tungsten carbide – WC | 2176 |
| 51 | Aluminium hydroxide – Al(OH)<sub>3</sub> | 2104 |
| 52 | Sodium nitrite – NaNO<sub>2</sub> | 2094 |
| 53 | Calcium sulfate (Gypsum) – CaSO<sub>4</sub> | 2052 |
| 54 | Hydrobromic acid – HBr | 2023 |
| 55 | Sodium silicate – Na<sub>2</sub>SiO<sub>3</sub> | 1912 |
| 56 | Potassium carbonate – K<sub>2</sub>CO<sub>3</sub> | 1870 |
| 57 | Perchloric acid – HClO<sub>4</sub> | 1866 |
| 58 | Copper(II) oxide – CuO | 1855 |
| 59 | Sodium borohydride – NaBH<sub>4</sub> | 1807 |
| 60 | Lead(II) nitrate – Pb(NO<sub>3</sub>)<sub>2</sub> | 1785 |
| 61 | Copper(II) nitrate – Cu(NO<sub>3</sub>)<sub>2</sub> | 1770 |
| 62 | Zinc chloride – ZnCl<sub>2</sub> | 1713 |
| 63 | Barium chloride – BaCl<sub>2</sub> | 1695 |
| 64 | Prussian blue (Iron(III) hexacyanoferrate(II)) – Fe<sub>4</sub> 6</sub>>[link]<sub>3</sub> | 1692 |
| 65 | Phosgene – COCl<sub>2</sub> | 1652 |
| 66 | Cisplatin (cis-platinum(II) chloride diammine]] – PtCl<sub>2</sub>(NH<sub>3</sub>)<sub>2</sub> | 1650 |
| 67 | Potassium chlorate – KClO<sub>3</sub> | 1596 |
| 68 | Silver chloride – AgCl | 1596 |
| 69 | Cobalt(II) chloride – CoCl<sub>2</sub> | 1583 |
| 70 | Aluminium sulfate – Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> | 1569 |
| 71 | Phosphine – PH<sub>3</sub> | 1479 |
| 72 | Copper(II) hydroxide – Cu(OH)<sub>2</sub> | 1456 |
| 73 | Barium hydroxide – Ba(OH)<sub>2</sub> | 1446 |
| 74 | Barium sulfate – BaSO<sub>4</sub> | 1415 |
| 75 | Phosphorus pentoxide – P<sub>2</sub>O<sub>5</sub> | 1412 |
| 76 | Zinc sulfate – ZnSO<sub>4</sub> | 1376 |
| 77 | Hydrogen fluoride – HF | 1308 |
| 78 | Trisodium phosphate – Na<sub>3</sub>PO<sub>4</sub> | 1283 |
| 79 | Boron nitride – BN | 1239 |
| 80 | Potassium sulfate – K<sub>2</sub>SO<sub>4</sub> | 1230 |
| 81 | Copper(I) oxide – Cu<sub>2</sub>O | 1226 |
| 82 | Carbon disulfide – CS<sub>2</sub> | 1192 |
| 83 | Iron(II) oxide – FeO | 1190 |
| 84 | Sodium sulfite – Na<sub>2</sub>SO<sub>3</sub> | 1160 |
| 85 | Potassium bromide – KBr | 1148 |
| 86 | Magnesium carbonate – MgCO<sub>3</sub> | 1111 |
| 87 | Sodium iodide – NaI | 1083 |
| 88 | Gallium arsenide – GaAs | 1067 |
| 89 | Thionyl chloride – SOCl<sub>2</sub> | 1015 |
| 90 | Lithium carbonate (Lithium salt) – Li<sub>2</sub>CO<sub>3</sub> | 1015 |
| 91 | Boron trifluoride – BF<sub>3</sub> | 1000 |
| 92 | Sodium sulfide – Na<sub>2</sub>S | 990 |
| 93 | Phosphorus trichloride – PCl<sub>3</sub> | 986 |
| 94 | Aluminium nitrate – Al(NO<sub>3</sub>)<sub>3</sub> | 975 |
| 95 | Tin(II) chloride – SnCl<sub>2</sub> | 973 |
| 96 | Sodium bromide – NaBr | 961 |
| 97 | Sulfurous acid – H<sub>2</sub>SO<sub>3</sub> | 947 |
| 98 | Chromic acid – CrO<sub>3</sub> | 945 |
| 99 | Hydrogen bromide – HBr | 896 |
| 100 | Copper(II) carbonate – CuCO<sub>3</sub> | 895 |
| 101 | Mercury(II) chloride – HgCl<sub>2</sub> | 894 |
| 102 | Silane – SiH<sub>4</sub> | 891 |
| 103 | Lithium chloride – LiCl | 883 |
| 104 | Iron(III) nitrate – Fe(NO<sub>3</sub>)<sub>3</sub>(H<sub>2</sub>O)<sub>9</sub> | 878 |
| 105 | Zinc sulfide – ZnS | 865 |
| 106 | Lithium aluminium hydride – LiAlH<sub>4</sub> | 835 |
| 107 | Calcium carbide – CaC<sub>2</sub> | 815 |
| 108 | Barium nitrate – Ba(NO<sub>3</sub>)<sub>2</sub> | 814 |
| 109 | Sodium hydride – NaH | 777 |
| 110 | Carboplatin – C<sub>6</sub>H<sub>12</sub>N<sub>2</sub>O<sub>4</sub>Pt | 768 |
| 111 | Nickel(II) chloride – NiCl<sub>2</sub> and hexahydrate | 767 |
| 112 | Copper(I) chloride – CuCl | 760 |
| 113 | Mercury(I) chloride – Hg<sub>2</sub>Cl<sub>2</sub> | 727 |
| 114 | Ammonium bicarbonate – NH<sub>4</sub>HCO<sub>3</sub> | 725 |
| 115 | Sodium cyanide – NaCN | 721 |
| 116 | Phosphite – HPO<sub>3</sub><sup>2-</sup> | 721 |
| 117 | Chromium(III) oxide – Cr<sub>2</sub>O<sub>3</sub> | 716 |
| 118 | Sodium chlorate – NaClO<sub>3</sub> | 707 |
| 119 | Lithium hydroxide – LiOH | 705 |
| 120 | Gallium nitride – GaN | 704 |
| 121 | Phosphorous acid (Phosphoric(III) acid) – H<sub>3</sub>PO<sub>3</sub> | 701 |
| 122 | Iron(II) chloride – FeCl<sub>2</sub> including hydrate | 692 |
| 123 | Hydroxylamine – NH<sub>2</sub>OH | 685 |
| 124 | Lead(II) iodide – PbI<sub>2</sub> | 675 |
| 125 | Calcium fluoride – CaF<sub>2</sub> | 642 |
| 126 | Lead(II) chloride – PbCl<sub>2</sub> | 616 |
| 127 | Magnesium phosphate – Mg<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> | 605 |
| 128 | Osmium tetroxide (osmium(VIII) oxide) – OsO<sub>4</sub> | 599 |
| 129 | Aluminium nitride – AlN | 560 |
| 130 | Dinitrogen pentoxide (nitronium nitrate) – N<sub>2</sub>O<sub>5</sub> | 555 |
| 131 | Titanium nitride – TiN | 549 |
| 132 | Arsenic trioxide (Arsenic(III) oxide) – As<sub>2</sub>O<sub>3</sub> easily confused with arsenous acid As(OH)<sub>3</sub> | 543 |
| 133 | Strontium chloride – SrCl<sub>2</sub> | 525 |
| 134 | Potassium perchlorate – KClO<sub>4</sub> | 521 |
| 135 | Caesium chloride – CsCl | 520 |
| 136 | Silver iodide – AgI | 512 |
| 137 | Cyanogen – (CN)<sub>2</sub> | 510 |
| 138 | Sulfamic acid – H<sub>3</sub>NO<sub>3</sub>S | 507 |
| 139 | Borane – Diborane: B<sub>2</sub>H<sub>6</sub>, Pentaborane: B<sub>5</sub>H<sub>9</sub> Decaborane: B<sub>10</sub>H<sub>14</sub> | 501 |
| 140 | Lead(II) sulfate – Pb(SO<sub>4</sub>) | 497 |
| 141 | Chromium trioxide (Chromic acid) – CrO<sub>3</sub> | 490 |
| 142 | Vanadium(V) oxide – V<sub>2</sub>O<sub>5</sub> | 489 |
| 143 | Sodium percarbonate – 2Na<sub>2</sub>CO<sub>3</sub>.3H<sub>2</sub>O<sub>2</sub> | 488 |
| 144 | Chromium(III) chloride – CrCl<sub>3</sub> | 466 |
| 145 | Lead(II) oxide – PbO | 464 |
| 146 | Manganese(II) chloride – MnCl<sub>2</sub> | 460 |
| 147 | Tin(IV) chloride – SnCl<sub>4</sub> | 457 |
| 148 | Lithium bromide – LiBr | 445 |
| 149 | Iron(II,III) oxide – Fe<sub>3</sub>O<sub>4</sub> | 437 |
| 150 | Cadmium telluride – CdTe | 437 |
| 151 | Potassium sulfide – K<sub>2</sub>S | 427 |
| 152 | Soda lime – | 417 |
| 153 | Lead(II) sulfide – PbS | 415 |
| 154 | Uranium hexafluoride – UF<sub>6</sub> | 414 |
| 155 | Tin(II) fluoride – SnF<sub>2</sub> | 413 |
| 156 | Nickel(II) nitrate – Ni(NO<sub>3</sub>)<sub>2</sub> | 410 |
| 157 | Aluminium fluoride – AlF<sub>3</sub> | 404 |
| 158 | Molybdenum disulfide – MoS<sub>2</sub> | 403 |
| 159 | Yttrium barium copper oxide – YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub> | 392 |
| 160 | Oxygen difluoride – OF<sub>2</sub> | 387 |
| 161 | Silicic acid – x</sub>(OH)<sub>4-2x</sub>>[link]<sub>n</sub> | 383 |
| 162 | Lithium hydride – LiH | 381 |
| 163 | Diborane – B<sub>2</sub>H<sub>6</sub> | 377 |
| 164 | Silver sulfide – Ag<sub>2</sub>S | 376 |
| 165 | Xenon difluoride – XeF<sub>2</sub> | 375 |
| 166 | Phosphorus tribromide – PBr<sub>3</sub> | 370 |
| 167 | Bromine trifluoride – BrF<sub>3</sub> | 362 |
| 168 | Lead zirconate titanate – Pb x</sub>Zr<sub>1-x</sub>>[link]O<sub>3</sub> (e.g., x = 0.52 is Lead zirconium titanate) | 359 |
| 169 | Barium titanate – BaTiO<sub>3</sub> | 356 |
| 170 | Beryllium chloride – BeCl<sub>2</sub> | 356 |
| 171 | Cobalt(II) sulfate – CoSO<sub>4</sub> | 355 |
| 172 | Trifluoromethanesulfonic acid – CF<sub>3</sub>SO<sub>3</sub>H | 346 |
| 173 | Yttrium aluminium garnet – Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> | 342 |
| 174 | Zinc iodide – ZnI<sub>2</sub> | 334 |
| 175 | Arsine – AsH<sub>3</sub> | 318 |
| 176 | Boron carbide – B<sub>4</sub>C | 315 |
| 177 | Xenon tetrafluoride – XeF<sub>4</sub> | 315 |
| 178 | Iodic acid – HIO<sub>3</sub> | 312 |
| 179 | Phosphorus pentafluoride – PF<sub>5</sub> | 312 |
| 180 | Lithium sulfate – Li<sub>2</sub>SO<sub>4</sub> | 312 |
| 181 | Calcium hydride – CaH<sub>2</sub> | 310 |
| 182 | Aluminium phosphide – AlP | 310 |
| 183 | Boron trichloride – BCl<sub>3</sub> | 309 |
| 184 | Beryllium oxide – BeO | 306 |
| 185 | Iodine pentafluoride – IF<sub>5</sub> | 299 |
| 186 | Antimony trioxide – Sb<sub>2</sub>O<sub>3</sub> | 297 |
| 187 | Gold(III) chloride – (AuCl<sub>3</sub>)<sub>2</sub> | 286 |
| 188 | Copper(I) sulfide – Cu<sub>2</sub>S | 281 |
| 189 | Nickel(II) oxide – NiO | 278 |
| 190 | Strontium nitrate – Sr(NO<sub>3</sub>)<sub>2</sub> | 277 |
| 191 | Sulfuryl chloride – SO<sub>2</sub>Cl<sub>2</sub> | 274 |
| 192 | Hydrogen selenide – H<sub>2</sub>Se | 273 |
| 193 | Iodine monochloride – ICl | 267 |
| 194 | Chromium(IV) oxide – CrO<sub>2</sub> | 260 |
| 195 | Selenium dioxide – SeO<sub>2</sub> | 256 |
| 196 | Carbonyl sulfide – COS | 255 |
| 197 | Lithium nitrate – LiNO<sub>3</sub> | 250 |
| 198 | Hypophosphorous acid – H<sub>3</sub>PO<sub>2</sub> | 250 |
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