Classify the bonds formed between each pair as ionic, polar covalent, or nonpolar covalent based solely on each element's position on the periodic table.

O-O, Fe-O, Al-N, O-I, S-I, Br-Br, P-Br, Be-Cl

you have to find the differences of electronegativity for the atoms joined by the bond. if their diff is <0.4,

then it's non-polar if it's between 0.4 to 1.7

then it's polar 1.7 and up it's ionic Electronegativity values can be found on most periodic tables.