Science

When Marie Curie isolated uranium from pitchblende, she realized that the 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 detective.
D. Pitchblende should be used as radiation therapy.
I believe the answer is A?
Thank you

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  1. I don't agree with A.

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  2. OK, then the answer must be b?

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  3. yes. Do you know what that element was?

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  4. Is it polonium or maybe Radium

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  5. It was Po.

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  6. the answers are..

    1. C
    2. B
    3. B
    4. D

    100%

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