Reasoning for why HNO3 is considered a strong acid

[Uma Patil 2A]

How would you justify HNO3 being a strong acid (other than experimentally)? Is it because of the size difference between NO3- and H+? I thought that H was strongly bonded to the NO3, which would make it a weak acid, but according to the first achieve problem the opposite is true.

[Ethan Mai 1D]

I think part of the reason why HNO3 is a strong acid lies in the electronegativity difference between H and the NO3 which it is connected to. There is a large electronegativity difference between H and the atoms of NO3, so even though they form a bond of ionic character, the highly electronegative nitrogen and oxygen atoms will distort and pull electrons away from H. As a result, HNO3 is more likely to give up the H and be a strong acid in solution. I hope this helps!