本题目来源于试卷: Molecules and Solids，类别为 IB物理学
[问答题]
Explain on the basis of ev a6po2i7za zi93tz eie6xx2 i:cm;p )nergy bands why the sodium chltg;7k+1 u; lueasl e8poride crystal is a good insulator. [Hint: Consider the shell 7sgu;a8 e+lkel utp1;s of $ \text{Na}^+ $ and $ \text{Cl}^- $ ions.]
参考答案:
The partially filled shell in Na is the 3s shell, which has 1 electron in it. The partially filled shell in Cl is the 2p shell which has 5 electrons in it. In NaCl the electron from the 3s shell in Na is transferred to the 2p shell in Cl, which results in filled shells for both ions. Thus when many ions are considered, the resulting bands are either completely filled (the valence band) or completely empty (the conduction band). Thus a large energy is required to create a conduction electron by raising an electron from the valence band to the conduction band.
本题详细解析:
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