# Size of atomic shells

Is the distance of some $$n^{th}$$ shell ($$n$$ $$\neq$$ outermost shell) from the nucleus of an atom different for different elements?

If so, then how much is the difference or how could we calculate it?

Yes, the size* of the $$n$$-th shell will differ between elements. The reason is that the nuclear charge will shrink each shell as it goes up. Additional electrons cannot fully compensate this effect because they do not perfectly shield the core.