In 1913, an Element Was Known to "Emanate" from Radium-226

question 109

Multiple Choice

In 1913, an element was known to "emanate" from radium-226 by  emission and then to decay to polonium-218, also by  emission. What was the unknown element?

• A)radon-222
• B)lead-214
• C)plutonium-238
• D)bismuth-214
• E)lead-218

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