A key discovery underlying Marie Curie's hypothesis about radium was that:
A) Pitchblende emits less radiation than pure uranium.
B) Thorium emits more radiation than pitchblende.
C) Pitchblende emits more radiation than pure uranium.
D) Pitchblende emits more radiation than radium.
E) Radium emits more radiation than thorium.

Question

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Marie Curie discovered that pitchblende emits more radiation than pure uranium, which led her to hypothesize the existence of a new, highly radioactive element. This eventually led to the discovery of radium, which emits even more radiation than pitchblende.

A Key Discovery Underlying Marie Curie's Hypothesis About Radium Was