What's an electroscope? How does it work?
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1 Answer to "What's an electroscope? How does it work?"
Posted by Adadastralgi Apr 22nd, 2012 at 10:22PM
It was a 19th century object that gave different elements "fingerprints" to identify them. That's how someone discovered helium. He saw a new fingerprint when looking at the sun and named it helium because he thought it was a metal (only metals and strontium and helium end in 'ium')
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