Answer:-
Atomic theory explains that all matter is made up of tiny, indivisible particles called atoms. First proposed by ancient philosophers, it was later refined by scientists like John Dalton, who suggested that atoms of different elements have unique properties. Over time, discoveries by Thomson, Rutherford, and Bohr revealed subatomic particles—protons, neutrons, and electrons—and how they interact. Modern quantum mechanics further explains atomic behavior, energy levels, and bonding. This theory is fundamental to chemistry and physics, shaping our understanding of reactions, elements, and the universe’s composition. It continues to evolve with new research in particle physics and nanotechnology.
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