C. What are noble gases?
D. What cause the low chemical reactivity of noble gases?
E. How were noble gases understood in the past?
F. What is the periodic table?
27. Noble gases are not very chemically______.
【答案】:F
28. Among the elements of noble gases Helium is the____.
【答案】:C
29. The required number of electrons in noble gases` outer shell is _____.
【答案】:B
30. MRI may make operating on the patient ______.
【答案】:A
A. unnecessary
B. complete
C. lightest
D. important
E. flammable
F. reactive
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