Answer:
The statement "Henri Becquerel and the Curies are famous for discovering that the atom is not indivisible, a belief held since the time of the Greek philosophers." is true.
Explanation:
Henri Becquerel, Pierre and Marie Curie were three French physicists that in the year 1903 received the Nobel Prize of Physics due to their research and discoveries regarding radioactivity. Becquerel was the first person to discovered, in the year 1896 that atoms were neither indivisible nor mutable, discovery that challenged the previously constituted ideas on atomic structure. Pierre and Marie Curie were the first two people in working with radioactivity and discovering the atomic elements radium and polonium during a research in 1898. All of these physicists worked around the same time with radioactivity and researching the atomic theory, giving new perspectives to the subject.