Seawater contains Hydrogen, Oxygen, Sodium, Chlorine, Magnesium, Sulfur, Potassium, Calcium, Bromine, Molybdenum, Ruthenium, Rhodium, Palladium, Argentum, Cadmium, Indium, Stannum, Antimony, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Fluorine, Neon, Aluminium, Silicon, Phosphorus, Argon, Scandium, Titanium, Vanadium, Chromium, Manganese, Iron, Cobalt, Nickel, Tellurium, Iodine, Xenon, Cesium, Barium, Lanthanum, Cerium, Praesodymium, and Neodymium, along with some creepy-crawlies that it would be better not to describe.