Answer:In 1896, I Antoine Henri Becquerel while investigating uranium salts, Becquerel accidentally discovered radioactivity.
Step-by-step explanation:
Here are some notes he took;
- Noticed phosphorescence caused film exposure after leaving uranium in the sun. •
- Noticed same thing happened on cloudy days.
I Becquerel found that the photographic plates were fully exposed when in contact with radioactive salt.
Hence my discovery.