My atomic theory states that all matter is made of atoms which are invisible, it also says that all atoms of a given element are identical in mass and properties.
I did the cathode ray tube experiment and that showed that all atoms contain tiny negatively charged subatomic particles or electrons.
I also made the plum pudding model of the atom, which had negatively-charged electrons embedded within a positively-charged "soup"
I turned over Thomson's model of the atomic theory in 1911 with my gold foil experiment in which showed that the atom has a tiny and heavy nucleus.
in 1932 I bombarded beryllium atoms with alpha particles, an unknown radiation was produced.
Since 1932, through lots of experimentation, many additional particles have been found in the atom. Also, new elements have been created by bombarding existing nuclei with various subatomic particles
I put a piece of beryllium in a vacuum chamber with some polonium, the polonium emitted alpha rays which struck the beryllium.
in 1913 I proposed a theory for the hydrogen atom based on quantum theory that energy is transferred in only certain well defined quantities. Also electrons should move around the nucleus but only in prescribed orbits. My theory could explain why atoms emitted light in fixed wavelengths.
around the nucleus but only in prescribed orbits.
I also conducted a thought experiment. I considered trying to measure the position of an electron with a gamma ray microscope. The high-energy photon used to illuminate the electron would give it a kick, changing its momentum in an uncertain way.