Question

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?

Answer 1

Marie Curie concluded that pitchblende contained other more radioactive elements than uranium after finding that it was more radioactive than the uranium extracted from it, leading to the discovery of polonium and radium.

Step-by-step explanation:

When Marie Curie was studying pitchblende, she observed that the pitchblende was more radioactive than the uranium she extracted from it. This led her to conclude that there must be other, more radioactive elements present within the pitchblende. After thorough research and experimentation, she and her husband Pierre Curie eventually isolated two new elements: polonium, named after Marie's native country of Poland, and radium, named for its intense radioactivity. Radium, in particular, was found to be significantly more radioactive than uranium, highlighting that the high radioactivity of pitchblende was due to these impurities.

Answer 2

The unknown radioactive element is present in pitchblende.

Step-by-step explanation:

Marie Curie was the scientists that mainly worked on the radioactive element. She was the first scientist who won the noble prize in two different fields of science.

The pitchblende was the mineral sample that was noticed by Marie curie during her experiment. Pitchblende contains a more radioactive element that uranium and confirms that she had found a new element.The new element was polonium with hundred times more radioactive than uranium.

Thus, the answer is unknown radioactive element is present in pitchblende.