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atomic theory is a theory of the nature of matter, which states that matter is composed of discrete units called atoms, as opposed to the obsolete notion that matter could be divided into any arbitrarily small quantity
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"plum pudding" model—the electrons were embedded in the positive charge like plums in a plum pudding (although in Thomson's model they were not stationary, but orbiting rapidly).
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Eletrons move in orbits like the rings around saturn.
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Electrons move randomly in the space around the nucleus.
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the electrons movein spherical orbits at fixed distances from the nucleus.
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an electron cloud is a visual model of the most likely locations for electrons in an atom.
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Atomic nuclei contain neutrons and positivelycharged protons.
