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Yes he is because he mainly study the nuclear nature of atoms.
Rutherford discovered the proton in 1919 during his gold foil experiment. This experiment showed that atoms have a dense, positively charged nucleus at their center. Rutherford's findings revolutionized the understanding of atomic structure.
He picked up a piece of metal and looked at it REALLY carefully, and he could see inside the atoms.
Benjamin Franklin did not discover the structure of atoms. The atomic theory was formulated by John Dalton in the early 19th century, proposing that all matter is made up of indivisible particles called atoms.
There are a few things that are true about gold that could not be discovered in Rutherford's experiment. There are solid atoms in the region that are called Nucleus.
Ernest Rutherford used the technology of radioactivity and conducted the famous gold foil experiment to discover the structure of the atom. By directing alpha particles at a thin gold foil, he observed how they were deflected, which led to the understanding that atoms have a small, positively charged nucleus at their center.
Rutherford by passing interpretation about the famous alpha particle scattering experiment came to the conclusion that the positively charged nucleus is of small size of the order of 10-15 m where as the atom size is of the order of 10-11m
Rutherford discovered that almost entire mass of an atom is located in the nucleus, and then, the neutron was discovered by Chadwick.
Rutherford compared bombarding atoms with particles to playing with marbles because, just as marbles can bounce off each other or collide in unpredictable ways, particles striking atoms can lead to various outcomes, such as deflections or reactions, revealing the structure of the atom. During this phase of his work, Rutherford discovered the nucleus of the atom and identified the proton as a subatomic particle, fundamentally altering our understanding of atomic structure.
Ernest Rutherford, following the "gold foil" experiment.
Ernest Rutherford mostly believed in that it was mostly empty space with positively charged atoms.
Rutherford discovered the atomic nucleus and the proton. A short answer for the Rutherford atomic model: the atom is composed from a central part - a nucleus, positively charged, surrounded by electrons - very small negative charged particles.