The second type of element is noted by its lack of metallic properties. These are the nonmetals.
第二种元素由于缺乏金属的性质而被关注，即非金属。
ALLOY: a substance with metallic properties composed of two or more chemical elements at least one of which is metal.
合金：由一种金属跟另一种或几种金属或非金属所组成的具有金属特性的物质。
However some metals such as aluminum or magnesium have low densities and are used in applications that require other metallic properties but also require low weight.
然而，诸如铝和镁之类的一些金属则具有低密度，并被用于既需要金属特性又要求重量轻的场合。
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