What is the correct size from smallest to largest in the atoms?

When comparing the sizes of atoms, they can generally be arranged from smallest to largest based on their atomic radius. The order is typically: hydrogen (the smallest atom), followed by helium, then other light elements such as lithium and beryllium. As you move down the Periodic Table, atoms generally increase in size due to the addition of electron shells, with larger atoms like cesium and francium being among the largest.