Radium spontaneously decays into helium and radon. Why do you think radium is regarded as an element

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Radium spontaneously decays into helium and radon. Why do you think radium is regarded as an element rather than as a chemical compound of helium and radon in the way that water, for example, is considered a chemical compound of hydrogen and oxygen?

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The Physical Universe

ISBN: 978-0077862619

16th edition

Authors: Konrad B Krauskopf, Arthur Beiser

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