How to Determine that a Substance is an Element?

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Question description

In 1807,the english chemist passed an electric current though molten potassium hydroxide and islolated a bright shiny reactive substance. He claimed it to be potassium. In those days before the advent of modern instruments. What was the basis on which one could claim that a substance was an element?

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(Top Tutor) Daniel C.
School: UT Austin
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