The size of cation is always bigger than the size of anion.
False
It can be commonly said that the size of a cation is smaller than the size of an anion.
In the picture above, we observe that the size of the Cesium ion is almost same as the size of the Nitrogen ion! Cesium is one of the largest atoms in its normal state and its size reduces drastically after ion formation. Looks are not deceiving.