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you can see the example of electromagnetic flux
quantum mechanics (qm; also known as quantum physics, quantum theory, the wave mechanical model, or matrix mechanics), including quantum field theory, is a fundamental theory in physics describes nature at the smallest scales of energy levels of atoms and subatomic particles.
quantum mechanics gradually arose from theories to explain observations could not be reconciled with classical physics, such as max planck's solution in 1900 to the black-body radiation problem, and from the correspondence between energy and frequency in albert einstein's 1905 paper explained the photoelectric effect. early quantum theory was profoundly re-conceived in the mid-1920s by erwin schrödinger, werner heisenberg, max born and others. the modern theory is formulated in various specially developed mathematical formalisms. in one of them, a mathematical function, the wave function, provides information about the probability amplitude of position, momentum, and other physical properties of a particle.mark my answer as aanswer
chemical reactions cause atoms to be rearranged.
and maybe atoms cannot be created or destroyed. he said were the smallest so i guess he meant couldn't be destroyed or broken down.
at daltons time, didn't know about protons, electrons and neurtons or a nucleus.