النتائج (
الإنجليزية) 1:
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The metal can be defined as a natural substance with a distinctive chemical structure or variable in a limited range and has fixed internal crystalline structure and sometimes appears in the form of crystals and amorphous form more often. Notes from the above definition that the metal is a substance found in nature and not to human, animal or plant into the composition. Also note that the chemical composition is not sufficient to determine the metal where it is necessary to know the Crystal structure that controls many of the natural qualities of metal such as hardness walmkhdsh and specific weight and color. And there are the chemical on a metal or more different from each other completely different from each other, for example carbon is in nature a metal diamond is the hardest known metals and there is a metal graphite is less metal hardness. Scientists have so far more than 2,000 different metal all common metals that go into installing rocks and minerals not exceeding 200 economic metal only.
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