Schrodinger used the mathematical equation also known the Schrodinger Equation to improve the atomic model used at the time. He discovered that the electron didn’t follow the regular orbit. It was in a cloud that spirals around the nucleus. Schrodinger’s concept was put down because it was difficult to complete.
Soddy worked with Earnest Rutherford to help explain that radioactivity is the transmutation of elements. They showed that radioactive elements decay into other elements producing alpha, beta, and gamma radition. He also showed that radioactive elements may have radiation and that thay may have more then one atomic mass although the chemical properties are identical he named this concept isotope, "same place"
He discovered that electrons travaled around the nucleus. And that they did this when giving off or absorbing light. Thus causing them to travel around the nucleus. He used Planck's quantum theory to help him figure this out.
He was a part of a team that helped discover the electron. He had a part in the discovery but his largest contrubitaion was the naming of the discovery. But J. J. Thompson was the one who took credit for the discovery.
He thought that matter could not be divided indefintely. Like if you took a piece of matter and tore it in half again and again then eventually you woul not be able to break it anymore. He named the smallest particle of matter, atoms.