Democritus proposed the first particle theory of matter in 430 B. C.E. He claimed that matter was made from small, indivisible bits. He referred to these bits as atomos, a Greek word meaning "uncuttable.” What is the modern definition of an atom?
Group of answer choices
the smallest particle of matter
the smallest particle of a pure substance
the smallest particle that can still be considered an element
a unit of matter with a mass equal to one gram
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