(i) The smallest unit of an element, which may or may not have an independent existence, but always takes part in a chemical reaction, is called …………………. [atom/molecule]

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Solution

The smallest unit of an element, which may or may not have an independent existence, but always takes part in a chemical reaction, is called an atom.
An atom is the tiniest unit of matter that may or may not exist independently but is always involved in a chemical process.

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