Nitrogen and fluorine are both nonmetals so that makes the bond a covalent bond. It's not hard.
The name after IUPAC is nitrogen trifluoride (in English).
This bond is covalent.
There is one lone pair of electrons on the nitrogen atom.
A ionic bond
You have answered the question for yourself. The formula is NF3 The name of the substance is nitrogen trifluoride.
Covalent bond
covalent bond in NH3
Nitrogen and bromine will form a covalent bond; they are both nonmetals.
Covalent bond.
It is a covalent bond (as in NF3)
covalent bond
it forms a triple bond