The classification of solids into molecular, metallic, covalent (polymeric) and ionic types is useful,provided it is recognized that there are no hard boundaries between them.

 
  • 如果认为各种固体间没有明确的界线,那么把固体分成分子的,金属性的,共价原子的(聚合体的)和离子的等等是有用的
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