Which pair of elements can form ionic bonds? A.
copper (Cu) and nitrogen (N)
B.
gallium (Ga) and phosphorus (P)
C.
hydrogen (H) and sulfur (S)
D.
phosphorus (P) and fluorine (F)
E.
potassium (K) and bromine (Br)

E.  potassium (K) and bromine (Br)

Explanation:

An ionic bond is formed between compounds with a large electronegativity difference between them. It is usually between a metal and non-metal.

Potassium is a true metal found in group 1 on the periodic table. Bromine is a highly electronegative non-metal which is a halogen. Potassium will lose one of its electrons which will be gained by the Bromine. The electrostatic attraction between the two species will cause the ionic bond to form. The ability of one specie willing to lose electron and the other gaining, is the main bed rock of ionic bonding.

Ais stronge