how to look at the periodic table and determine whether a bond between two elements is covalent or not if the electronegativity values are not provided?

Question

anonymous · Answer

Left side-Metals 
Right side - non metals 

Ionic: metals and non metals 
Covalent: non metal and non metals

anonymous · Answer

yes estudio is right also,electronegativity increases from bottom left to upper right. For ex. B would have a lower electronegativity than F would.