2. 自考
  3. A. unnecessary B. complete C. lightest D. safe E. flammable F. reactive The required number of electrons in noble gases outer s

A. unnecessary B. complete C. lightest D. safe E. flammable F. reactive The required number of electrons in noble gases outer s

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问题 A. unnecessary
B. complete
C. lightest
D. safe
E. flammable
F. reactive
The required number of electrons in noble gases outer shell is______.
选项
答案B
解析 题干：惰性气体外层电子数应为……。根据第4段第3句“Noble gases have a full outershell，meaning that they have complete electrons in their outer shell”可得知，惰性气体外层电子数是全满的。故选B。
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