Atom defention in class 9th science
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The smallest indivisible particle or unit of an element is called an atom, which can take part in a chemical reaction and may or may not exist independently. An element is a pure substance which cannot be subdivided into two or more new substances by any means. The word “ATOM” is given by “John Dalton”.
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Atom is the smallest building block of matter. atoms are very smaller in nature that they are unable to see through naked eyes
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