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He believed that matter is made up of atoms, which are small,  hard particles.
He said the matter could not be broken down into smaller parts indefinitely.

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THE FIRST ATOMIC THEORY WAS CREATED BY HIM.
Atoms were regarded by Dalton as small, stable spheres.

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According to Thomson's model, the atom is made up of electrons surrounded by a broth of positive charge to counteract the negative charges of the electrons, just like negatively charged "plums" surrounded by positively charged "pudding." Hans Geiger and Ernest Marsden's gold foil experiment in 1909 disproved the 1904 Thomson model.

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The atom is largely hollow space, with almost all of its mass contained in a tiny central nucleus, according to Ernest Rutherford. The nucleus is positively charged and is surrounded by negatively charged electrons at a considerable distance.

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Niels Bohr suggested a quantum theory-based theory for the hydrogen atom in 1913, stating that energy is transmitted only in such well-defined amounts. Electrons can only pass around the nucleus in specific orbits. A light quantum is released as a particle jumps from one orbit to another of lower energy.

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James Chadwick used alpha particles to bombard beryllium atoms in 1932. An unexplained radiation was released. This radiation, according to Chadwick, is made up of ions with a neutral electrical charge and the density of a proton. The neutron was named after this atom.

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Erwin Schrodinger was a mathematician and physicist Erwin Schrödinger built an efficient model of the atom in 1926. The Schrödinger model considers the electron to be a wave and aims to classify the regions of space, or orbitals, where electrons are most likely to be located.