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
the answers are..
1. C
2. B
3. B
4. D
100%
OK, then the answer must be b?
yes. Do you know what that element was?
Is it polonium or maybe Radium
Yes, you are correct. The answer is A. Pitchblende itself is a radioactive element.
Marie Curie's observations led her to conclude that pitchblende, the mineral from which she isolated uranium, was more radioactive than the uranium she had extracted. This suggested that pitchblende itself must contain a radioactive element or elements that are more potent sources of radiation than uranium.
To arrive at this conclusion, Marie Curie conducted a series of experiments to measure the radioactivity of different elements and compounds. By comparing the radioactivity of different substances, including uranium and pitchblende, she noticed that the pitchblende sample exhibited higher levels of radioactivity.
The increased radioactivity of pitchblende compared to uranium indicated that there must be other radioactive elements present in pitchblende, which surpassed the radioactivity of uranium on its own. This discovery eventually led to the subsequent isolation and identification of two new radioactive elements: polonium and radium.
Therefore, Marie Curie's conclusion was that pitchblende itself is a radioactive element (option A).