Define atom .(NCC 2018 question for 18 marks).
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Atom→
An atom is a particle of matter that uniquely defines achemical element. An atom consists of a central nucleus that is usually surrounded by one or more electrons.
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Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction. all matter is composed of very tiny particles called atoms. atoms are also building blocks. these are very tiny particles.
more than millions of atoms when stacked would make a layer barely as thick as paper sheet .
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