Recent Articles

Valency

In chemistry, valency is the power of an atom of an element to combine with other atoms measured by the number of electrons which an atom will give, take, or share to form a chemical compound. This is related to the number of spaces left in an atom's electron shells, which is why the only elements with valencies of zero are the noble gases.

See also: Chemical affinity, oxidation number, Hydrogen1 2Helium0 3Lithium1 4Beryllium2 5Boron3 6Carbon2, 4 7Nitrogen3, 5 8Oxygen2 9Fluorine1 10Neon0 11Sodium1 12Magnesium2 13Aluminium3 14Silicon4 15Phosphorus3, 5 16Sulfur2, 4, 6 17Chlorine1, 3, 5, 7 18Argon0 19Potassium1 20Calcium3, 5 21Scandium3 22Titanium3, 4 23Vanadium2, 3, 4, 5 24Chromium2, 3, 6 25Manganese2, 3, 4, 6, 7 26Iron2, 3 27Cobalt2, 3 28Nickel2, 3 29Copper1, 2 30Zinc2 31Gallium2, 3 32Germanium4 33Arsenic3, 5 34Selenium2, 4, 6 35Bromine1, 3, 5, 7 36Krypton0 37Rubidium1 38Strontium2 39Yttrium3 40Zirconium4 41Niobium3, 5 42Molybdenum2, 3, 4, 5, 6 43Technetium2, 3, 4, 6, 7 44Ruthenium3, 4, 6, 8 45Rhodium3, 4 46Palladium2, 4 47Silver1 48Cadmium2 49Indium1, 3 50Tin2, 4 51Antimony3, 5 52Tellurium2, 4, 6 53Iodine1, 3, 5, 7 54Xenon0 55Caesium1 56Barium2 57Lanthanum3 58Cerium3, 4 59Praseodymium3 60Neodymium3 61Promethium3 62Samarium2, 3 63Europium2, 3 64Gadolinium3 65Terbium3 66Dysprosium3 67Holmium3 68Erbium3 69Thulium2, 3 70Ytterbium2, 3 71Lutetium3 72Hafnium4 73Tantalum3, 5 74Tungsten2, 4, 5, 6 75Rhenium1, 4, 7 76Osmium2, 3, 4, 6, 8 77Iridium3, 4 78Platinum2, 4 79Gold1, 3 80Mercury1, 2 81Thallium1, 3 82Lead2, 4 83Bismuth3, 5 84Polonium2, 3, 4 85Astatine1, 3, 5, 7 86Radon0 87Francium1 88Radium2 89Actinium3 90Thorium4 91Protactinium4, 5 92Uranium3, 4, 5, 6 93Neptunium2, 3, 4, 5, 6 94Plutonium2, 3, 4, 5, 6 95Americium2, 3, 4, 5, 6 96Curium2, 3, 4 97Berkelium2, 3, 4 98Californium2, 3, 4 99Einsteinium2, 3 100Fermium2, 3 101Mendelevium2, 3 102Nobelium2, 3 103Lawrencium3