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The name atom comes from the Greek ἄτομος ( atomos, " indivisible ") from ἀ-( a -, " not ") and τέμνω ( temnō, " I cut "), which means uncuttable, or indivisible, something that cannot be divided further.
The concept of an atom as an indivisible component of matter was first proposed by early Indian and Greek philosophers.
In the 17th and 18th centuries, chemists provided a physical basis for this idea by showing that certain substances could not be further broken down by chemical methods.
During the late 19th and early 20th centuries, physicists discovered subatomic components and structure inside the atom, thereby demonstrating that the ' atom ' was divisible.
The principles of quantum mechanics were used to successfully model the atom.

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