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The current theoretical model of the atom involves a dense nucleus surrounded by a probabilistic 'cloud' of electrons In and, atomic theory is a of the nature of, which states that matter is composed of discrete units called. It began as a philosophical concept in ancient Greece and entered the scientific mainstream in the early 19th century when discoveries in the field of chemistry showed that matter did indeed behave as if it were made up of atoms. The word atom comes from the adjective atomos, meaning 'indivisible'.