There are only two atoms, so the VSEPR shape is linear.
The Lewis structure of
#":N≡"stackrel("+")("O")":" ⟷ ":"stackrel("+")("N")"=Ö:"#
The first structure is the more important contributor because it has the maximum number of covalent bonds.
Each atom has two electron domains, so the electron geometry about each atom is linear.
The molecular geometry ignores the lone pairs.
Since there are only two atoms, molecular geometry is linear.