An atom is the basic building block of Matter.
In simpler language, an atom composes Matter itself. This idea first came to Acarya Kannada, who gave the idea of something that could not be divided further.
An atom is the unit of matter, just like a brick is the unit of a house.

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It is a building block of any matter.It has properties of a chemical element. Every solid ,liquid and gases or plasma consists of atoms.It's size is typical and is around 100 pm
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