If the four other metals "do not form oxides" it would pretty well have to be oxygen, wouldn't it? 

I can't kind what happened in GB in 1624, other than a fire in Dumfermline, Scotland. 

Blair

On Fri, 12 Oct 2012 11:08:47 -0400, Paul Reid <[log in to unmask]> wrote:

>I think answer is oxygen and the answer to the bonus question is the
>first four noble metals: osmium, iridium, platinum, and gold.
>
>Paul Reid 
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