The smallest unit of matter which cannot be broken down except in nuclear reactions is known as

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An atom is the smallest unit of matter that cannot be broken down except in nuclear reactions. An element is a substance made up of only one type of atom, but it is composed of multiple atoms. Matter is anything that takes up space and has mass. A molecule is a group of atoms bonded together, which can be broken down into smaller pieces through chemical reactions.

The Smallest Unit of Matter Which Cannot Be Broken Down