Is N-O ionic or covalent

Answer 1

Definitely covalent. The electronegativity difference isn't great enough for a bond between Nitrogen and Oxygen to be ionic. In order for a bond to be Ionic, the electronegativity difference must be 2.7 or greater. The electronegativity difference of N and O is merely .4. Not even close! The further apart on the Periodic Table two elements are, the greater the electronegativity difference. Electronegativity GENERALLY increases going up and to the right on the table. There are, however, some cases in which exceptions can be noted, but they are not too common.

Answer 2

ionic