He discovered the particles of everything so him and j.j. Thompson made up the particle model of matter.
Thomsons model (plum pudding model of negatively charged particles in a positive soup) differed from Daltons model. Dalton hypothesised that atoms were indivisible, the word atom comes from the Greek atomos cannot be cut)
In mixtures, different substances retain their individual properties because they are not chemically combined. The particle model of matter explains this by showing that particles in mixtures remain separate and do not form new compounds. In solutions, particles of one substance are evenly distributed throughout another substance, which aligns with the particle model's description of particles mixing uniformly at the molecular level.
There are 4 states of matter in the particle theory but only 3 are taught at keystage 3 and 4 in UK schools (high school level in the US).These three are Solid, Liquid and Gas.The fourth state of matter is plasma.
Change in the phase of matter is just related to the distance between the particles, and hence a change in the amount of attractive forces.
The standard particle model is a theory in particle physics that describes the fundamental particles and forces that make up the universe. It includes elementary particles such as quarks, leptons, and bosons, as well as the interactions between them through fundamental forces like electromagnetism, the weak force, and the strong force. This model has been successful in explaining and predicting a wide range of phenomena observed in experiments.