Answer:-
An atom is the basic unit of matter that defines an element. It consists of a nucleus containing protons (positive charge) and neutrons (no charge), surrounded by electrons (negative charge) moving in energy levels. Atoms are incredibly small, measuring in nanometers, and form the foundation of all substances. They combine with other atoms to create molecules, which make up different materials. Despite their tiny size, atoms hold significant energy, as demonstrated in processes like nuclear fission and fusion. Everything in the universe, from living organisms to inanimate objects, is made up of these fundamental particles.
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