What is Atomic size?
Atomic size or the size of an atom is defined by its atomic radius; and atomic radius is nothing but the distance between the centre of the nucleus of an atom and the outermost electron in its outermost shell.
Atomic radius
What is the Unit of atomic radius?
The unit of atomic radius is given in nanometres (nm). One nanometre is equal to one billionth of a metre, that is 10−9m.
One nanometre
Let’s take the example of a hydrogen atom. The atomic radius of a single isolated hydrogen
atom is shown below:
