门捷列夫元素周期系有七十以上的元素属於金属,它们位於周期表的左部和下部。周期系第一和第八族的许多元素,都属於金属。金属和非金属不同的地方,是它们的物理性、化学性和机械性。所有金属都有结晶的构造,其中许多具有高度的坚固性,电和热的传导性,以及可塑性。这些在技术上重要的性质,决定着金属在实践中的广泛应用。固态金属所固有的物理性和机械性质,决定於内部构造和原子间键的性质。和离子键或共价键不 The Mendeleev’s Periodic System has more than seventy elements belonging to the metal, which are on the left and the bottom of the periodic table. Many elements of cycles I and VIII belong to the metal. Differences between metals and non-metals are their physical, chemical and mechanical properties. All metals have a crystalline structure, many of which have a high degree of robustness, electrical and thermal conductivity, and plasticity. These technically important properties determine the wide range of applications of metals in practice. The inherent physical and mechanical properties of solid-state metals depend on the internal structure and the nature of the inter-atomic bonds. And ionic bond or covalent bond not