What is an example of an atom?

Excuse me, could you please provide me with an example of an atom? I've been reading about the building blocks of matter, but I'm having a bit of trouble visualizing what an atom actually looks like. Is it possible for you to give me a simple yet illustrative example to help me understand? I'm particularly interested in understanding the structure and properties of atoms, so if you could explain how the parts of an atom interact and contribute to its overall characteristics, that would be incredibly helpful. Thank you so much for your time and assistance.