Potassium
chemical element with atomic number 19 Potassium, 19 K Potassium pearls (in paraffin oil, ~5 mm each) General properties Pronunciation / p ə ˈ t æ s i ə m / ( pə- TAS -ee-əm ) Appearance silvery gray Standard atomic weight.mw-parser-output .nobold{font-weight:normal} ( A r, standard ) 7001390983000000000♠ 39.0983(1) [1] Potassium in the periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellu