{{User:Just granpa/Atomic volume|radius}} produces the radius form above.
This template first calculates the atomic volume by dividing the atomic mass by the density (just like above).
Then it calculates the atomic radii.
This template repeatedly calls User:Just granpa/Atomic radius cell.
{{User:Just granpa/Atomic volume|radius2}} produces the radius form in units of ground shell radius shown above.
A nitrogen atom, for example, is 3 times larger than its ground shell.
By this measure all of the increase in atomic radius occurs between Noble Metals and noble gases.
(Except for a brief and inexplicable increase for alkali metals which are 25% larger than expected)
The radius of the ground shell is assumed to be proportional to 1/Atomic number.
No attempt has been made to account for shielding of the nucleus.