Atom.

Q4.What is an atom?
Ans.
Atoms are what every substance is made of. Atoms are the smallest recognizable bit of any substance. They are so small that they are visible only extremely high -powered -microscopes- you could fit two billion atoms on the full stop at the end of the sentence. Yet atoms are largely composed of empty space- empty space dotted with even tinier clouds of energy called sub-atomic particles.

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