第十四章碳族元素 Chapter 14 The carbon family elements Carbon(C) Silicon(Si) Germanium(Ge) Stannum(Sn) Tin Plumbum(Pb) Lead第十四章 碳族元素 Chapter 14 The carbon family elements Carbon (C) Silicon (Si) Germanium (Ge) Stannum (Sn) Plumbum (Pb) Tin Lead