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Updated: May 27, 2025
Very important, however, was his demonstration of the compound nature of the spark-spectrum, which he showed to be made up of the spectrum of the metallic electrodes superposed upon that of the gas or gases across which the discharge passed.
As we said a moment ago, radium appears to be an elementary substance, as shown by its spark-spectrum being different from that of any other known substance the determinative test as fixed by the International Chemical Congress. A particle of radium free from impurities should, therefore, according to the conventional conception of an element, remain unchanged and unchangeable.
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