Question

What is the central atom of N₂O?

Answer 1

Possible arrangements for N2O and the formal charges from left to right
N=N=O, N≡N−O, N−N≡O, N=O=N, N≡O−N.
best arrangement of atoms to form a molecule has the formal charges all equal to zero.
The next is the arrangement with the formal charges closest to zero with the most electronegative element having the negative formal charge.
The best arrangement of atoms and electrons for N2O is N≡N−O.
The less electronegative element is usually the central atom.