Atomic radii of the elements (data page)

Atomic radii measure how big the atoms of different elements are. The bigger the atomic radius, the bigger the atom is. Looking at a data page, the information can tell us how big each atom of an element is relative to other elements. For example, the atomic radius for hydrogen is 0.31 Å, which is the smallest of all the elements. On the other hand, the atomic radius for cesium is 2.35 Å, which is the largest of all the elements.