3.5 This question is poorly worded. The metals that were intended were silver and gold.
(This information isn’t in the book. The student would have to do a bit of web
searching.) Silver has better conductivity than copper and gold while having poorer
conductivity than copper, has good immunity to oxidization. The reason for not
using gold or silver is that they both have the property that they can migrate and
enter the silicon. This alters CMOS device characteristics in undesirable ways. This
question should probably be reworded in any new printing.
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