A single ringed nitrogeo base is thymine (C)
Density is an intrinsic property, so it is independent of the amount of substance present: one gold coin would have the same density as a solid gold boulder.
So if the density of gold is 19.3 g/cm³, the density of a bar of gold and the pieces into which the bar is cut would all be 19.3 g/cm³.
When considering atomic orbitals the only important information they really wanted to know is the size of the orbit, which was described by using quantum numbers.
C. or A. Is your best bet
