A. Marie Curie
B. Henri Becquerel
C. Ernest Rutherford
D. Max Planck
Explanation: Henri Becquerel discovered spontaneous radioactivity in 1896 while studying uranium salts.
A. Marie Curie
B. Henri Becquerel
C. Ernest Rutherford
D. Max Planck
Explanation: Henri Becquerel discovered spontaneous radioactivity in 1896 while studying uranium salts.