how would you describe an atom and give an example?

how would you describe an atom and give an example?
Answer
Brief Explanations:
An atom is the basic unit of matter. It consists of a nucleus (containing protons and neutrons) surrounded by electrons. For example, a hydrogen atom has one proton in its nucleus and one electron orbiting it.
Answer:
An atom is the basic unit of matter with a nucleus and electrons. Example: hydrogen atom.