But empty space is not empty!. I'm no physicist, but space contains all kinds of stuff. And we're not sure if our universe is the only one out there! https://interestingengineering.com/...e-atoms-you-are-mostly-made-up-of-empty-space https://www.space.com/24870-what-is-space.html
As for the simplest atom in the Periodic Table, the Hydrogen atom has a single Proton as its Nucleus, surrounded by a single orbiting Electron. To give a perspective in everyday terms, if the Proton were expanded to the size of a Golf Ball, then the Electron's orbit would be three miles in diameter. Hal