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OpenStudy (anonymous):
when Marie curie isolated uranium from pitchblende, she realized that pitchblende was more radioactive than the uranium she had extracted. What did she conclude about her observations? A: Pitchblende itself is a radioactive element B: The pitchblende sample contained an unknown radioactive element C: The pitchblende sample was defective or D: Pitchblende should be used as radiation therapy. PLEASE HELP!
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OpenStudy (cwrw238):
B
OpenStudy (anonymous):
Thank you!
OpenStudy (anonymous):
b
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