A, the names of gold, silver, copper, iron, chromium, nickel, lead and zinc all have gold characters next to them, so they are metals, so they are correct.

B, gold, silver, copper, iron, chromium, nickel, lead and zinc all have gold characters next to them, while nonmetals are generally stone characters or gas characters, so it is wrong.

C, oxide is a compound composed of two elements, one of which is oxygen, and they are all composed of one element, so it is wrong.

D, the compound is a pure substance composed of different elements, all of which are composed of one element, so it is wrong.

So choose a.