non polar
polar
or ionic
1 Ca and Si
2 Cl and Rb
3 F and Ca
4 O and O
5 Li and O
6 Li and H
7 Be and N
8 Br and Br
9 Se and K
10 H and B
11 H and H
12 Br and K
1 Ca and Si: polar covalent
2 Cl and Rb: ionic
3 F and Ca: ionic
4 O and O: nonpolar covalent
5 Li and O: ionic
6 Li and H: polar covalent
7 Be and N: polar covalent
8 Br and Br: nonpolar covalent
9 Se and K: polar covalent
10 H and B: polar covalent
11 H and H: nonpolar covalent
12 Br and K: ionic