3.Body-centered cubic packing:(bec) Coordination number(配位数)：8 Spatial occupancy factor(空间占有率)： 68.02%
3.Body-centered cubic packing: (bcc) 68.02% Coordination number(配位数)：8 Spatial occupancy factor (空间占有率):
Types of interstice between close-packed layer .Tetrahedral interstice: 一层的三个球与 上或下层密堆积 的球间的空隙
Types of interstice between close-packed layer •Tetrahedral interstice： 一层的三个球与 上或下层密堆积 的球间的空隙
Octahedral interstice: 一层的三个球与 错位排列的另一 层三个球间的空 隙
•Octahedral interstice： 一层的三个球与 错位排列的另一 层三个球间的空 隙
10.2.2 metallic bond theory:金属键理论 1.electron sea model 电子海模型 alkali metal Alkaline earth metal Characters of metal:conductivity,.ductibility(延展性)， heat transmittance(导热)、luster(光泽)，etal
1. electron sea model 电子海模型 10.2.2 metallic bond theory金属键理论 alkali metal Alkaline earth metal Characters of metal: conductivity, ductibility(延展性), heat transmittance(导热)、luster(光泽) , et al
2.energy belt theory 能带理论 Quantum mechanics for metal bond based on molecular orbit theory is called as energy belt theory. E Li:1s22s1 AO MO AO Molecular orbit of Li, Li分子轨道能级图
2. energy belt theory 能带理论 2s 2s 1s 1s Molecular orbit of Li2 Li 分子轨道能级图 Quantum mechanics for metal bond based on molecular orbit theory is called as energy belt theory. Li: 1s22s1