ANSWERS: 1
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I think you will get a for sure answer if you look this one up in a chemsitry text... Here is a bit... http://www.3rd1000.com/elements/noble.htm As for why did it take so long to get discovered... how long is a peice of string, why do people say silly things, ... It can't be answered why something took so long to discover - maybe they didn't have the knowledge & tools to make those kids of discoveries until they invented them!
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