Ernest Rutherford concluded, based on experimental evidence, that each atom consists of a core nucleus with electrons orbiting around the nucleus in the same way that planets orbit around the sun. [
Encyclopedia Britannica, 2024] Years later, scientists decided that Rutherford's theory is incorrect, and they replaced it with a more complicated quantum atomic model that explained the newer experimental results. [
Bohr, 2024] So, the simplest theory of Rutherford's time was wrong. Occam's Razor failed in this situation.