5 THIS QUESTION IS POORLY WORDED. THE METALS THAT WERE INTENDED WERE...

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.