![]() ![]() The movement of electrical impulses through nerve fibers and the contraction of muscles are both mediated by the ions Ca 2+ and Mg 2+.\): Elements categorized into metals, non-metals and metalloids.Beryllium is used in the manufacture of alloys.Metals are otherwise defined according to their position on the Periodic Table. By using barium, vacuum tubes can be made airless. The definition of metal: A substance with high electrical conductivity, luster, and malleability, which readily loses electrons to form positive ions ( cations ).Radium is employed for cancer treatment. ![]()
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