They are neither. Neon and Argon are nobel gases, which means they don't normally bond at all, for they have a full outter electron shell.
It is ionic
No, it is not a covalent bond. It is an Ionic bond.
covalent
covalent
Covalent
covalent
Covalent bond
Covalent
covalent bond
Covalent Bond
Covalent bond is more common than ionic bond.
Ionic bond