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  • 1. 3Litio– LithiumMass: 6,941 u[He]2s1Melting point: 453,69 KBoiling point: 1615 KDensity: 535 kg/m3Discovery: Johan August (1817)Under standard conditions it is the lightest metal and the leastdense solid element. Like all alkali metals, lithium is highly reactive andflammable. For this reason, it is typically stored in mineral oil. When cutopen, lithium exhibits a metallicluster, but contact with moistair corrodes the surface quickly to a dull silvery gray, then black tarnish.Because of its high reactivity, lithium never occurs freely in nature, andinstead, only appears incompounds, which are usually ionic.